From the IMDB:
"Trivia: While the series was in color during its original run, only a few episodes have survived in color. All the rest of the episodes have survived on black and white "kinescopes" (TV images recorded on film). This is because NBC destroyed the tapes in the 1970s once Smith-Hemion Productions turned down the offer to take them into their possession."
Once again the short sighted Network erased the tapes
