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Vintage Heuer Discussion Forum
The place for discussing 1930-1985 Heuer wristwatches, chronographs and dash-mounted timepieces. Online since May 2003.
Keith, thank you very much for your reply.
There are at least two caseback variations on the Ref. 13-1.
text in the middle of the case back, reference number written as „13 1“, same as listed at the OTD reference table.
text on the outside of the caseback, reference number written as „13/1“
See here (also note the difference in the dial design at 3 o´clock):
This one also had the same caseback with the 13/1 (the seller provided me with a picture of the caseback):
You can find a lot more of the second variation on the net but I show only the ones I found at OTD.
I can provide the links to other examples with the second case back style, but I think the moderators should decide about this.
Anyway, all the visible information I found leads to the following conclusion for the 13-1:
- two caseback designs
- two dial designs