PC's last date shown in Tom Lord is a Wynton Kelly trio date on 8/4/68. He played Left Bank with Blue Mitchell on 9/15/68. The rest of the band was Sonny Red, Bobby Timmons and Lennie McBrowne. He died on 1/4/69.
Based on a secret list I have, a tape existed 20 years ago. Not sure if John Fowler still has it, but PC's very last recording may still be out there and I am sure it is better than the Wynton Kelly date. Not sexy enough for Zev Feldman, I guess.
Bertrand.
PS: It is also one of the last Bobby Timmons dates. He was at Left Bank with Dexter Gordon on 5/4/69, and that seems to be his last recording.