Looking for help ID'ing big MiJ impact gun

[De-troit Debbie]

Bought this the other day at a guy's yard sale that is selling off father in law's ("hoarder") tool collection. Details in the garage sale thread, but short story I walked away with this thing basically for free or $20+free other tools, depending on how you look at the way the negotiations went. Anyway, it had a nice coating of grease so all I had to go on when I was looking at it was "Japan" and a serial number.



Cleaned it up and saw some engraving but I'm having a hell of a time finding anything that looks similar and obviously the model number doesnt turn anything up or I wouldnt be asking yall.



checked all the brands mentioned in this thread with no luck.
http://www.garagejournal.com/forum/showthread.php?t=199343

I did see a chicago pneumatic that kinda sorta looked similar but they all kind of do i guess.

I'm going to get a proper fitting on there, open it up and make sure nothing is too messed up then probably put it to work.

Any ideas? Thanks for looking

 

[De-troit Debbie]

bump for the day crew. I'll probably tear into this thing in the next day or two. I'll post pictures of any carnage.