I'm Eric, and I've been modding Casio watches since early 2023. In June of 2023, I came up with the idea to start selling my custom watches.Why? I'll show you.

Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of their Casio, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I began using the same method that Casio does to create its seamless strap look by notching not only leather straps, but nylon NATOs too.I figured that the same way nylon straps are heat sealed during their manufacturing process, that same way I could melt the material before and after notching them to ensure the material doesn't fray. This allows me to make the trademark custom Casio + NATO watch, with the improved aesthetics that come with the strap now blending perfectly with the rest of the watch.

The Casio Royale - reimagined for stealth.The AE-1200 PHANTOM is an aesthetic reinterpretation of the classic Casio Royale. The watch is unified in all-black through the addition of a custom, hand-notched 24mm leather strap with black buckles and keepers. A negative display mod has been performed, along with lettering removal on both the case and faceplate with only the Casio logo and minutes indicators left. Durable, lightweight, practical - now with a touch of class.

© ARCH-MOD / EC Thurn 2024

All trademarks pertaining to Casio
belong to Casio Computer Co., Ltd.

The A158 RETROSILVER is an aesthetic upgrade to the original Casio A158W.The RETROSILVER mod is not intended to overhaul the look, but rather to enhance it. This was done with the addition of a high quality nylon strap in combination with a negative LCD to match the black watch face.The original metal strap has been replaced with a quality 22mm NATO nylon strap in blue-green-red, precisely notched to fit the full width of the watch, ensuring a proportional look.
It has been heat-sealed to prevent any fraying.Although still a nylon strap, you may find that this type of strap is considerably softer and more comfortable than most NATO nylon straps due to the seatbelt-style nylon used in its construction.

Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of the A158, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I developed a simple yet effective method to adjust these nylon straps to ensure a perfect fit.I think you'll like it.

© ARCH-MOD / EC Thurn 2024

All trademarks pertaining to Casio
belong to Casio Computer Co., Ltd.

What if we took the F-91W; a practical, no-frills watch, flipped it on its head and made it into something rather glamorous? Well, the F-91W ROYAL is exactly that.Modifications include a negative LCD mod to blend with the rest of the black faceplate, and a navy blue strap with gold buckles to match the gold-coloured case of the watch.The original resin strap has been replaced with a quality 22mm NATO nylon strap in navy blue with a gold buckle, precisely notched to fit the full width of the watch, ensuring a proportional look.
It has been heat-sealed to prevent any fraying.

Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of the F-91W, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I developed a simple yet effective method to adjust these nylon straps to ensure a perfect fit.I think you'll like it.

© ARCH-MOD / EC Thurn 2024

All trademarks pertaining to Casio
belong to Casio Computer Co., Ltd.

With its rugged, durable build, alongside its world time feature, I've always seen the Casio AE-1200 as a watch fit for explorers.The EXPLORER mod aims to do the AE-1200 justice by building upon its aesthetic with the addition of a durable military Zulu strap and a splash of colour with the amber display. All text has been removed except for the Casio logo for a cleaner look.The original metal strap has been replaced with a 24mm Zulu nylon strap, precisely notched to fit the full width of the watch, ensuring a proportional look. It has been heat-sealed to prevent any fraying.

Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of the AE-1200, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I developed a simple yet effective method to adjust these nylon straps to ensure a perfect fit.I think you'll like it.

© ARCH-MOD / EC Thurn 2024

All trademarks pertaining to Casio
belong to Casio Computer Co., Ltd.

The F-91W RACER is a combination of style and practicality, aiming to do the rarer, discontinued F-91WG-9QER model justice by expanding on the black-yellow-red colour combo with a custom NATO strap and negative display.The original resin strap has been replaced with a 22mm seatbelt-style NATO strap in black-yellow-red with bronze buckles, precisely notched to fit the full width of the watch, ensuring a proportional look.
It has been heat-sealed to prevent any fraying.

Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of the F-91W, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I developed a simple yet effective method to adjust these nylon straps to ensure a perfect fit.I think you'll like it.

© ARCH-MOD / EC Thurn 2024

All trademarks pertaining to Casio
belong to Casio Computer Co., Ltd.

The F-91W RETROCHROMA mod pays tribute to the bright, contrasting retro colours of the original Casio F-91W. I've been wanting to perform this mod for a while now but could never quite find the right strap to match the blue-red-yellow of this model until I found just the right one from a small strap store, allowing me to finally complete this mod.The F-91W RETROCHROMA features a standard negative LCD mod. It looks better on some watches than others, with this model being a perfect fit as the now yellow digits go very well along
with the yellow accents on the faceplate.The original resin strap has been replaced with a quality 22mm NATO nylon strap in blue-red-green, precisely notched to fit the full width of the watch, ensuring a proportional look.
It has been heat-sealed to prevent any fraying.

Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of the F-91W, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I developed a simple yet effective method to adjust these nylon straps to ensure a perfect fit.I think you'll like it.

© ARCH-MOD / EC Thurn 2024

All trademarks pertaining to Casio
belong to Casio Computer Co., Ltd.

Monochrome has always been my favourite colour scheme. It only makes sense then, that I launch this new project of mine with a Casio F-91W modded with this minimal yet tasteful colour palette.The F-91W BLACKSILVER features a standard negative LCD mod, blending the display with the rest of the black faceplate for a sleek, seamless look.Most unique to ARCH-MOD is the precisely notched 22mm quality NATO strap in black + grey, fitted perfectly to the watch and heat-sealed to prevent any fraying.

Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of the F-91W, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I developed a simple yet effective method to adjust these nylon straps to ensure a perfect fit.I think you'll like it.

© ARCH-MOD / EC Thurn 2024

All trademarks pertaining to Casio
belong to Casio Computer Co., Ltd.

ARCH-MOD (A-M) is a hobby project started in June 2023 by Eric Thurn, making, showcasing, and selling high quality hand-modded custom Casio watches.ARCH-MOD stands out by making full-width, notched straps a standard in all custom watches on offer, as well as offering custom orders for those looking for something they just can't find anywhere else.All watches are modified by hand with great attention to detail, being thoroughly tested before and after the process is complete. Modifications include custom LCD colours, hand-notched custom straps, NFC chip installs, display and/or module swaps, custom lettering and repaints.

ARCH-MOD has consistently received 5 star ratings from customers on Etsy.
Here is what a few have to say:

store.arch-mod.com is a subdomain for arch-mod.com operating as the store page for ARCH-MOD. Unfortunately due to the limitations of the website builder I use, a separate subdomain needs to be used for the e-commerce section of the site. This is an extension of the main site.

All on-site transactions and data are securely processed by PayPal, an online payment system operating since 1998. A PayPal account is not necessary for checkout, but can be used if you have one.

- All items sold by ARCH-MOD are new, have never been used, and come with the original papers.- All items are fully tested prior to shipping - this includes functions, LCD display, sound and LED light.- I do not offer long-term warranty. However, I offer a 14 day return/exchange period in case any fault crops up within that time. See below section for details.- The modifications I perform usually involve opening the watch and modifying internal components, so Casio warranty is void.

I accept returns/exchanges within a 14 day time window in case of faults, in which case you will receive a full refund for the amount you purchased the item for, or the exchange item of your choosing plus or minus any price differences.A faulty product is defined as: where one or more of the aspects of the item received do not match the description, either functionally or cosmetically.If this applies to you, reach out to me at the address below.

For any enquiries, custom orders, returns, feel free to contact me via email at: archmod.contact@gmail.com - I usually respond within 24hrs.