I thought I'd share my experience with a cool watch I found this weekend. I bought a small pile of watches at a flea market this weekend. This one was in such bad shape, I didn't look at it until I got home.. then I found out it was a Girard Perregaux Gyromatic!
The watch has an ETA 1256 automatic movement. I took it apart and overhauled it, but I found out that the reason it wouldn't run was because the center gear had a bent end where the seconds hands attaches. I tried to bend it back but it broke (they always do). Frustrated, I just put it back together and figured it would just have 2 hands. lol
Later I decided to see if I could maybe source a seconds hand from a parts watch on Ebay or somewhere. Then I saw an article on the Internet that said Benrus used the ETA 1256, so I thought I'd see if I had a parts watch in my Benrus junk. What I found was a Benrus parts watch that had an ETA 1080 manual wind movement. The bridges looked similar so I did a search for ETA 1080 and the first line in the article referenced that the ETA 1080 was the base for the ETA 1256! Here is a photo comparing the two movements (my watch is on the left, and thanks in advance for Mr. Ranfft for letting me use his pic for comparison)...
I only need to remove two parts (the one bridge, and the ratchet gear) and I could pull the gear out I needed; dropping it back in my watch was just as easy. Then all I needed to do was put the seconds hand on. I though it was cool that I could use a gear from a manual wind watch to fix an automatic watch!
Here's some pics of the watch and movement..
Really cleaned up nicely and keeps great time! One more thing.. Buff up the case or don't buff up the case? I like the scratched look because I think it matches the condition of rest of the watch. Any thoughts?