I believe that #11 endlinks would fit, as would #511 endlinks. The bracelets I have seen on #11 endlinks are 1036, 1037, 1503, 8220, 8270, .
However, from my research I think that #12 endlinks would be more likely to be period correct. I have seen #11s more on early-mid 60s, and #12s more on 50s watches. The bracelets I have seen on #12 endlinks have been 1036, 1037, 1503, 8220 and 8270.
Can I also ask the reference of your watch?
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