Ended up purchasing this restored gold filled 351 bumper from a local watchmaker. It it is in nice condition and is very accurate. After doing some Googling and info from forums, I am left wondering if there are some incorrect aspects to the watch. Namely the presence of a sub dial on a 2577, and if the back cover is correct (is the rest of the watch a 2577). If there are some minor "franken" parts in the watch it doesn't really worry me in the wearing, but I would just like to be confident of the originality if in the future I sell it, or pass it on. I would appreciate any comments.