Just acquired this s/n c291845=1950.I think the dial is #168 single sunk and the case appears to be a#5 marked Hamilton Keystone J Boss 10 kgf Railroad Model.I have never seen a case#5 before and the pics in the book doesn't help me much on this paticular case.Seems to be a pretty nice watch ran 42 hrs.Any and all comments welcomed. Roger
Posts: 4093 | Location: Carbon, Texas in the USA | Registered: January 24, 2010
Your movement, hands and dial are a dead-on original 1950 combination.
However, the Hamilton Case Model 5 is significantly earlier. We know from Hamiton advertising that it was introduced in 1929 then likely gone by the mid-1930s and we believe White Gold Filled cases were not manufactured after 1934 which is an important date that is also to remember. Also, you may have noticed the additional set of case-screw marks from the previous "Pre-B" movement that was once in your case.
What I mean is, look at the rim on the case where the case-screws are placed, consider the pendant as "12:00" and referencing it as a clock dial the case-screws were positioned at approximately 11:00 and 5:00 on all Open-Face Hamiltons before the introduction of the 992B so I refer to those as the "Pre-B" watches. All of the "B" watches, meaning for the sake of this explanation the 992B and 950B movements and others related to them will have the case-screws at approximately the 1:00 and 7:00 positions. Knowing these points is especially helpful in knowing whether a particular movement and case combination could be an original combination.
I would tend to keep my eye open for a 1950 style case for this movement, hands and dial.
Hope this helps,
Lindell
Posts: 10553 | Location: Northeastern Ohio in the USA | Registered: November 19, 2002
