Here is the serial number off my 7 12 PQ5490 (i think it's a Q it could be an 0) located on the drive side of the BB. Next to it is stamped a 5 over and 8 which I presume means it is a 58 cm frame, especially since it is a 58 cm frame.
The color scheme is exactly like the one posted by superunleaded. The sticker on the frame says splined as does the one on the fork, so both the frame and fork are made from the splined tubing.