(Alternate titles include "Multiband 6 MTG-910 on a Budget" and -- like many other threads here -- "Casio Wouldn't Build the Watch I Wanted So I Just Did It Myself!")
This is a relatively simple "mod" that can be done in several different ways, but the backstory is a little long and complicated.
Part I -- The Backstory
The MTG-900 was the first digital watch I bought in years, the one that introduced me to Watchuseek, and because of its shortcomings, launched my collection of Casio watches. It's got a great digital display -- it's relatively uncluttered, it's got the largest digits of any G-Shock, and it's solar/atomic (which are features that I love). On the other hand, I didn't care for the bracelet, couldn't stand the behavior of the early atomics which update every hour after midnight, EVEN AFTER a successful reception, and really missed the lack of a countdown timer. (MTG-9xx's and GW-5xx's of this era included a "Time Memo" feature instead -- for more on that feature, see footnote in post #4.) I discovered this forum while Googling for replacement straps, and discovered that the resin straps from the GW-500 series were a perfect fit!
From this forum, I also learned how the silver paint often wore off the case, exposing an ugly beige resin underneath. Overall, I really didn't like that watch very much, so it gathered dust on my dresser while I discovered and bought some other G-Shocks that better suited my needs. Eventually, Casio introduced the Multiband 6 MTG-M900 -- the only real differences being Multiband 6 reception, the "new" behavior among Casio atomics where they stop receiving for the night after the first successful reception, and the inclusion of a 24 hour countdown timer!
I still didn't care for the bracelet, so I swapped the resin strap over from my "old" one -- but I really didn't like the "silver and chrome" color scheme, and thought the silver painted finish made it look kind of cheap. Pretty soon, I had TWO MTG-900's gathering dust on my dresser while I wore my other watches and bought a few others.
While mine were gathering dust, a few of us here at "f17" loudly complained about the flaws of the MTG- and MTG-M900 and probably scared a few potential buyers away. Most of the complainers agreed that while the external parts of the watch had flaws, the LCD itself was great, and the module would be great if it only had a countdown timer -- and when Casio released the Multiband 6 version, it DID include a countdown timer!
Complaints included "the bracelet seems awfully narrow for the overall size of the watch," "the clasp itself just feels really cheap," and there were many comments, complaints and pictures of the silver paint wearing off, showing the "ugly beige resin case underneath." But as it turns out -- and as NOBODY apparently knew or bothered to mention -- it's not actually the watch case!