1970's crystal chandelier

We recently bought a home in a very upscale neighborhood. The dining room chandelier is very elaborate, although not exactly in line with our tastes...

I am looking for any approximations on the value of this chandelier. I am certain that it is from the 1970's, as nearly everything in the home was original.

I have tried looking for distiguishing marks but have found none so far. Where would one usually find this type of mark?

Fair