The question was really about the Hamilton as I already have one of the plated versions of the BP Waltham, but thanks for the info and picture of your nice example. Mine arrived a couple of days ago and looks OK but the bezel is frozen solid so I'll need to try and free that up. I guess I'll have to be careful not to damage the insert though.
View attachment 454091
View attachment 454092
And the Hamilton turns out to be 34mm too, although it looks smaller. Seems to run but winding was stiff/rough, which on investigation seems to be because the movement ring isn't lined up correctly and is contacting the stem inside the case. Is that an easy fix ?
View attachment 454090
Click to expand...