Picked this up a few years ago from a fellow collector who had just bought it and was having problems keeping it running...He said it ran OK till he tightened down the caseback, then it would stop dead...
I bought it so cheap I'm almost ashamed to admit($40.00!!)
I simply opened it up, removed the movement, and bent the second hand down @ 1 mm, to keep it from hitting the crystal, put it together, and there it sits, still running 100%!!...I definitely prefer the el-cheapo 21j config on any GMT movement, since the modded ETA's and their clones aren't anywhere near as reliable, or accurate sweeping on the 24 hr hands...
I only wish I could find a display caseback to replace the incorrect solid seamaster one it now has...But...since only @ .01% of humanity knows it's incorrect, no biggie!!