I picked up a Hamilton 950B early 50s vintage but have a question. What is the part name or part number for what I would call that mainspring barrel hub. It is the part that the 4 screws hold down the larger winding wheel to the mainspring mechanism. Using the Hamilton 1961 parts catalog I can't make heads or tails of the correct part name.

If you're talking about the part that the 4 screws thread into to hold down the winding wheel, then I think it is part # 673 wheel, lower winding.

Doug

Thanks, I did find a source for the screws, the ones on the watch now had seen better days and I figured other than some less than acceptable screws the movement is in good shape. I wasn't sure if the part that the 4 screws that hold the winding wheel securely in place may have been damage and when getting it serviced just replace it also to be safe