Sorry it took a while.
It's a 52 cm frame, M565 throughout, Shimano date codes are SJ and SI, which means it's a 95 year model. The chainstays are straight and the tubing is not that special. The frame with the headset cups in is 2363 g and the fork weighs 928 g.
I've already sold that frame, but I have a Nakamura Shadow bike I'm about to disassemble. The sticker on the frame says Nakamura Light Weight Series. I can weigh that for you if you're interested.