I bought a Graflex Optar WA f6.8 90mm lens in a recessed board for 5 Canadian dollars, and a 25CM Graflex TELE-Optar f5.6 lens for 30 Canadian dollars today, both are mounted in Graphex shutters. The seller thought the WA90 did not work, thus the low price.

I took the shutter speed ring off and sock the shutter with lighter fluid and it backed to normal.

My question is, how can I find out which year these two lenses were produced? The WA 90 has a serial number 5786xx and the Tele Optar has 6153xx. Neither has the circle W mark, although the tele seems coated with a purple color but with the WA 90, I am not so sure since its elements are so tiny and hard to see the color of the coating.

Thanks,
Suibu