The removable handle is common on 3/4" drive and up; is that a 1/2" drive?
Very cool! have you hit up AA?
Got the same ratchet with two handles, a 15 and a 12.
I'll try to post some pics this weekend
It was called the "4 in 1" Ratchet. There were 3 handle lengths to choose from. Short,medium,long. When combined with the head it would be a 10",12", or 15" ratchet.
Look here at image 4 in the listing:
http://www.ebay.com/itm/Antique-30s-1943-Cornwell-Chevy-Ford-General-Auto-Tools-Manual-Catalog-22A-/221964330964?hash=item33ae1ae7d4:g:Ba4AAOSwDNdVmPrA&vxp=mtr