I didn't find a Diamond Back serial number thread. Does anyone know where I can unlock the mystery? I have an early 80s Ridge Runner with serial number N3G6516.

This frame also has some scrapes and paint missing from the fork ends and chain/seat stays. It seems to be chromed under the paint. Does anyone have any thoughts or info on that? Does it sound odd that this early 80s MTB would have a chromed fork and stays?