Like new airco gas torch set regulator left hand thds

What is for sale: Like new airco gas torch set regulator left hand thds

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Here we have a Very Nice Regulator, almost like new, maybe used for a very short time. I am not sure what it goes with, probably acetylene gas or similar such as propane because of the left hand threads but not sure, might be for inert gas?
The main inlet Threads are female LEFT HAND approx. 7/8" The outlet threads are approx. 9/16" LEFT hand male but that is just an adapter that can be replaced, the ports are both 1/4" npt right hand.
If you need a specific size of anything just ask.
If in Michigan add 6% sales tax. Thanks!