.049 Testors McCoy - identification assistance

So I bought a lot of "some good, some junk" motors on eBay.    see what I can rescue and rehabilitate, and what needs to go
the golden bee it came with is added to my "Now I have THREE of em - take THAT Billy Jo!!!!" collection

I now own, by the way:
- a HUGE collection of starter springs and sure-start spring plates
- quite a few vintage cox wrench tools
- a bunch of 90degree bent lexan plates with a cox logo sticker, that is probably some kind of display stand, but I dont know how to mount the engine without drilling the plastic

this cute little oddball snuck in

I know its Testors McCoy .049, with a self starter assembly,  it turns, it pops with compression,
but!  I am NOT going down ANOTHER .049 collecting rat-hole.

I'm not even gonna clean it up
but I am curious if anyone knows what it was meant to go with (big white tank)

and?  is anyone interested in it?   I'd love to trade it for a bunch of Cox .049 Piston/Cylinder sets for all the crankcases I now have.... 


any education is appreciated.