is there a label on those cranks?
I have a old frame with a takeoff crankset that looks like those, and they are 1994 shimano stx se [ the crank arms are a darker shade of polish?, for a better word for it] same black outer chainring so maybe 1994/1995 ish if they are the same set.
the front mech looks different than what I would remember for 1994/1995 though, so its just a guess.
doug