I'm currently trying to sell my Canon EF-S 17-55 f/2.8 IS USM and thought in the advert I would try date it.
On the underside of the barrel there is an eight digit serial number. On the lens mount there are no production codes.
According to a couple of resources online there should be either a code containing a few letters or on newer lenses a 10 digit serial number. I have neither. On the second resource, there is an example eight digit serial number they've dated the same way as the 10 digit BUT mine begins 21... which would age the lens at Sep 2014... I bought the lens used in 2009...
Am I able to date this lens or should I just accept I can't?