I just acquired this 1977 Case 62055 small cigar jack with jigged brown Delrin covers and CV steel. I'm excited to add this one to my small but growing collection. According to Steve Pfeiffer's book, the 055 pattern dates back to at least the Case Tested era, was discontinued in November 1978, and has never been brought back into production. In the 70s the pattern was randomly switched between bone and Delrin covers.
It's interesting to note that the "55" pattern designation is now used for the seahorse whittler. I don't know if this means that it's unlikely for the "055" to ever be brought back? That would be a shame, because it's a really nice pattern (although the current 032 small Texas Jack is similar in size and blade complement).