Who Made This Oiler?

[Singer B]

I recently acquired an M1 carbine via an auction. It is an Inland with a 340,XXX serial number. It is in a complete Type 3 configuration. It has the round bolt and a FATS stamp on the left side of the stock just forward of the sling well. It had a reproduction sling on it and the sling was secured with the usual oiler. I would like to identify the manufacturer of the oiler. It doesn't have the usual Roman numeral number markings and has a set of concentric circles stamped in the bottom and nothing on the cap. Can someone please identify this oiler? Thank you!