From the assembly date code, it's a '77 model year. These are pretty sweet bikes with double-butted chromoly top and down tubes. The stays and fork are 1020 carbon steel. The all-chrome version is particularly desirable. They were built by Panasonic in Japan for Schwinn.

If it fits you and is in good shape (chrome not pitted or peeling, no dents, and neither the stem nor seatpost are stuck), it's worth the asking price.