Author: Ken Shaw ★2017
Date: 2004-03-11 14:49
48707 (1954 or -55) is the highest pre-R-13 SN I've heard of. The lowest R-13 SN I've found is 48830 (1955). However, there were R-13 prototypes that were sold around that time. (I've seen one, without a serial number, which the owner told me he bought at the factory in 1954.)
You can easily tell the difference by the shape of the key guide for the top two trill keys. The pre-R-13 guide had flat, triangular prongs. The R-13 has a cylinder with a slot cut down the middle. This shows clearly on the eBay photo.
Best regards.
Ken Shaw
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