Age of Fujinon 400m T lens

[peter lagus]

All:

I am in the market for a Fujinon 400mm T lens. I am looking at two such lenses. Both seem to be in excellent condition. My question has to do with which lens is more recent (i.e. newer). Both have Copal 1 shutters, but in one lens the shutter adjustment ring appears to be black while the other has a steel (silverish) adjustment ring. Which lens is more recent?

Thanks for any input.

Pete

[vinny]

black ringed shutter is a newer shutter.