I think it was v2, although I'm not sure how I can check (file ~/.pwsafe.dat says "data").
The pwsafe package that was recently removed from Debian and Ubuntu says it's "[c]ompatible with CounterPane's PasswordSafe Win32 program versions 2.x and 1.x.", so I suspect v3 is not a possibility.
I think it was v2, although I'm not sure how I can check (file ~/.pwsafe.dat says "data").
The pwsafe package that was recently removed from Debian and Ubuntu says it's "[c]ompatible with CounterPane's PasswordSafe Win32 program versions 2.x and 1.x.", so I suspect v3 is not a possibility.