I just got a big box of watches from a retiring repairman. There's one that doesn't have a model number on the back. It has MTG on the band, but GMS on the back. It is a screwdown back, and the only number on the back is #007. On the face it says 300 water resistant. I just wondered if anyone had one of these, and knew what model it is. I wanted to download the manual, and can't without a module number.