Unfortunately I've lost the negative for this photo, but I was able to get some time on that machine Deckard used in the movie Blade Runner.
The text below the front seat says "CAPN JACK".
I can't make out the text under the skull and cross bones. :-(
After enlarging and enhancing the bottom of the registration numbers, it looks like the registration number is rather short. Four digits including the "N", N13T or N134. Both are valid T-34 registration numbers today nearly 19 years later.
After googling N13T and N134 I found something promising at the T-34.com website. The T-34 Association's Mentor Monitor 1991 July issue has a scan of Jack Richey's T-34 restoration project N13T. I think I have a match. Other back issues say that this aircraft won best T-34 at Oshkosh in 1991.