I believe the models 3, 4, 5, 6 and 7 all carried those markings.
Each of those very distinctive models are shown in Weldon Hopkins' Hamilton Factory Cases, My Collection and I'll bet looking at those should help to narrow it down.
Let us know which you are referring to which will make it easier.
Lindell
Posts: 10553 | Location: Northeastern Ohio in the USA | Registered: November 19, 2002
Lindell: I did not see this case. All the numbers match, so I know it is all one case. here is a picture of the watch, and the inside of the case back.
Posts: 767 | Location: Los Osos, California USA | Registered: December 12, 2002
What you have there Jerry looks like a model #3 case. It has the incorrect bow and according to the book it says it was introduced in May 1926. (check out page 234 of the watch guide) I'm sure I will be corrected if I'm wrong.
Gary
Posts: 141 | Location: Northwest Ohio in the USA | Registered: October 02, 2003