T-Mar, here's a later 1980's one for you which I found yesterday. A mixte Sport model with a red and white fade paint job.

Details:
Serial Number -- GC735889
Tubing Sticker: "Nishiki 4130 Chromoly Main Tubes"
Over Nishiki name on DT it says "Sport Series"
Crankset -- Sugino VP
RD -- Shimano Light Action RD-L532 with a LA date code (January 1987)
FD -- Shimano FD-Z202
Shifters -- black plastic Shimano Light Action SIS
Bars: Champion
Dia-Compe brake levers (with safety levers)
Dia-Compe sidepull calipers with a M 0187 code on them (January 1987)
Saddle: white Vetta with bag loops
Rims: Araya 27x1-1/8
Hubs: Joytek (I think) with QR
Pedals: not too fancy rat traps -- didn't note the brand but they say Taiwan on them. The toe clips are Christophe.

I didn't note the headset. The cogset still needs to be cleaned so I don't know what it is. Seat post is a straight post type and I didn't note what kind of stem it has. Cable routing is under the BB. Braze-ons: 1 set of water bottle mounts, cable guides on DT and on chainstay for RD cable. Front and rear dropouts have 1 set of eyelets each.

Other than the stem and seatpost being up in the stratosphere it is in nice shape.

Let me know if you need any other info, including other date codes and/or other photos you need.

(P.S. -- I have a Maruishi Catalog that I can get you a copy of if you want. It's a 1984 version and it reveals that a good portion of the generic labeled tubing on them is actually Tange or Ishiwata, with lots of detailed specifications for most models.)