First of all, I’ve never seen a Yale with that logo before. Perhaps it is like the Yale USFS locks, where most or all take the same key? A lot of the old government and utility locks were like that.
The problem for some of us in a situation like this is that impressioning can be maddeningly difficult. Perhaps the lock can be picked and the pin depths read prior to impressioning. This is the only way I’ve ever had any luck with this method. I wouldn’t take apart a rare lock unless I had no other choice, since disassembling to rekey will destroy the original finish. There’s no way to avoid it when removing/replacing the pins that hold the lock together. If the lock is really rare or valuable, it might be better to leave it as is, even if no key can be made.
Sometimes driving out the pins from a common Yale 850 or 840 and rekeying it is the only way to obtain a working padlock. I’ve encountered several of these that were so full of dirt and corrosion that taking them apart was the only way to fix them. Even if the outside is in great shape, the inside can be a corroded mess.
