I'm looking at a couple of lenses. A 16-35mm L and a 135mm f2.0L. I haven't seen them in person yet, but the owner says there is no date code on the. He understands what the date code is and where they are located, but says there is none there.
From the pictures of them I know they are not new enough to have no date code. Is this a cause for concern if no code is really on it. Maybe they were bought refurbished from canon or something?
Has anyone came across this?