Battery change on the G'Mix GM-100
The loudspeaker (front and backside)
I was pretty curious how Casio achieved such a loud alarm on a G-Shock and still have a 20 Bar water resistance. Remarkable is to see there are small holes in the back of the watch. Luckily the battery went dead, so I had to open the watch. The loudspeaker is not attached under the back plate, but is a special plate, which is pressed hard against the runner seal by the back, when the watch is closed. The two voices are achieved by using two alarm springs. The room between the loudspeaker and the back acts as a resonance box, which explain the hard sound of this watch. The module us hidden under another
The design of this GM-100 is inspired Rock (“Lock”) music. I’m not sure why, but the sword represents the Rock spirit. It reminds me a bit to a drawing I saw on Busy P’s facebook page about Rock Concerts from past until 2012.
The upper part of the strap is made of leather. This is used, because a lot of rock artists wear leather. The under part of the strap is made of a strong gauze material. This is probably to make the band good breathable.
This watch would not be complete with some rock songs for the alarms. There are 5 melodies, according the description of the watch, classics from the ‘50s until the ’90’s. They include “Heartbreak Hotel” by Elvis Presley (1956), “(I can’t get no) Satisfaction” by the Rolling Stones (1965), “Walk this Way’ by Aerosmith (1975), "New Year's Day" by U2 (1983), and “Smells like Teen Spirit” by Nirvana (1991). “Walk This Way is probably better known by the cover of Run DMC in 1986 featuring Steven Tyler and Joe Perry, the original writers of this song.
Next mode is the Alarm Mode. It has 5 Alarms on board. Every alarm can be linked to a song that you want to hear when the alarm goes off. It is also possible to choose a random song or a simple beep alarm. The Hourly Chime can be programed as a short melody or as a simple beep beep alarm.
The last function that you find on this watch is the Memo Mode. In this mode you can store 5 memo’s. Every Memo record can contain a title of maximal 8 characters (upper display) and 16 characters for the data (lower display).
If you are really annoyed about the loud sounds, but like a hourly chime, you can set the volume of the watch. You can set the volume when you are in Time keeping Adjust Mode. Also in this mode you can choose between a melody hourly chime or a simple beeping hourly chime.
The GM-100 models were not quit the cheapest G-Shock models. The recommended retail price of these models (there were in total 12 different models released) was ¥18000. For instance the DW-6900CK-3MJK G-Viper model, that was also released in June 2000 had a Recommended Retail Price of ¥12000. For that ¥18000 you got a very unique G-Shock. Specially the versions with this double strap with leather upper part. I cannot remember that Casio released a similar strap for a G-Shock, although the GL-100V models have similar construction with a double strap connected to the case on each side. If you are looking for one of these now, they are not easy to find. Since I found an English manual, I think the watch was also released in South East Asia, but still you don’t encounter them often. Actually it took a long time before I found one. This is my second GM-100 and also the best looking (like I wrote above, the other does only have a simple resin strap instead of the original one). I would like to have more of these. The double Velcro versions look very nice, specially the red model. If I ever will own more, I doubt it. It’s actually not the price. I paid less than $100 for this one, but they simply do not seem to cross my path that often.