Help with old film

So I bought a 2x3 grafmatic, and one of them is loaded with 6 sheets of film. One frame has been partially ruined (as soon as I saw gray, I slammed it shut again), but I'm interested in developing them to see what I get.

The notch code appears to be, as near as my fingers can make out, a match for Plus-X Pan Professional.

Does anyone know when Kodak stopped making Plus-X Pan Pro in 2.25x3.25? Would give me a starting point for development.

I'll probably use a bottle of D76 1:1 I mixed a few weeks ago and wound up not using. Or, I've got some Ilfosol 3 and some DDX I could use, but I recall a couple of people saying D76 should either be used immediately after mixing, or after a few weeks when the pH has settled back down.

I believe Kodak stopped making most 2x3 films in 1992. I have some Plus X in 4x5 that expired in 1994. I’ve been developing that in Pyrocat and FX-2 at normal times for a 100 speed film. I would think either of those developers would work.

Exposed or blank? If exposed my Data Guide says D76 stock 5 1/5 minutes 68 degrees, better dense that blank, so maybe 7 or 8? Plus X pan and pan professional have same listed so the times listed massive development char times should work. If unexposed, my guess that last made in the 90s, I would use ISO 25, and DDX should be good, 6 minutes.

I'm going to assume exposed-- I'm OK if I produce 5.5 sheets of blank film. And I have no idea if the seller cycled through the sheets or not-- so they may all be a wall of black fog.

But I appreciate the numbers.

Well, you can develop one sheet first. You could even cut that sheet into 3 pieces to test three different times. I, personally, would dunk one sheet in paper developer for a few minutes and see what I get. 1:2 Dektol develops pretty much anything within a couple of minutes.

D76 shouldn't be used right after mixing, it needs to sit a day to settle down in my experience. The idea of cutting up one sheet into several pieces and letting them develop at different times is a good one, and would be a quick way to see if you have anything or nothing.

DEKTOL or ansco 130. 1:5 for about 6 minutes .. shuffle and add a minute if it is not dense enough
both these developers work great with sheet film, and with aged film short and sweet and strong works best.