Here is some info I dug up...
"When introduced in 1982, the SC/SB series was available in plain Red, White or Blue finishes. The SC-3 and SB-1 seen here are blue, but with age their finishes have yellowed slightly, giving them a teal-like color." "The 1984 examples shown here are in Black, a finish option added later." and, "What’s unusual is that these are rarer white pickup covers (most were black). Accounts vary as to how many early Leo-era G&L instruments were given white pickups, but Paul Bechtoldt, author of G&L: Leo’s Legacy, claims to have a hand-written note from G&L co-founder Dale Hyatt saying only a few dozen guitars or basses had such covers."
Source:
http://www.vintageguitar.com/3889/gl-scsb-series/What great guitars these are!