Sorry. I will stop reading over that thread if you prefer.
Although I still like Kerry's post #44
"There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).
Garrett, I don't recall anything more from Les that was useful.
I'm afraid that the relationship between Wollensak lenses' serial numbers and dates of manufacture is one of those things that are not meant to be known. Same goes for Ilex lenses; B&L lenses, Klaus Schmitt's B&L list notwithstanding; and pre-CAMEROSITY Kodak lenses.
I can't speak for anyone else, but I was born ignorant and remain ignorant about many, many things.
A bit late, but if it adds to the data. Wollensak Series IIIA EX. W. A. f12.5 8x10 No 10642
I have a couple of them and they work well. RE: Raptar=tessar Velostigmat from WWII on = 3 element Cooke type.
Here's a coated example with a serial number in the 4xx,xxx range:
You may find a resource with Seth at cameraeccentric.com. If nothing else, his infor section has several complete Wollensak catalogs that will allow you to target your dates within a few years according to which catalog it appears in.
"One of the greatest necessities in America is to discover creative solitude." Carl Sandburg
lenser, have you tried what you recommended? I just took a look at a couple of the Wolly catalogs on cameraeccentric, couldn't read a single s/n. In addition, the latest catalog posted there is dated 1950. Please do the work and report back to us.
Oh, and by the way, your approach can't be used to date, for example, my Pro Raptars, which came to market after 1950.
Garrett, a s/n in a publication whose date is known sets an upper bound on the year the s/n was engraved. The s/n can't be newer than the publication. This may, doesn't have to be, useful.