Get in touch with an HVAC guy or a supply house. My recently passed BFF was such a guy and as far as I can recall some of the out of date refrigerants classify as liquid gold. Andy
Recently, I had to replace the compressor in my home A/C. A 30 lb bottle of R22 replacement was $500. I have a friend in the business and this was at his cost. Supply house said that actual R22 would have been $1500. What you have there has got to be $2500.
Interested to see as Ive got the same thing, as well as a "NOS" R22... bought up stock to recharge our home AC's when supply became restricted. Now we have new systems running on the new stuff & dont need these anymore. Ive heard its valuable but who the heck is buying this stuff ? Also have a couple cases of the small cans too.
Its worth something for sure ! But only to someone with an R12 system Im not sure when it was phased out some where in the mid 90s Im thinking i heard as much as 500.00 a pound and more retail not sure who would pay that when you could replace / change compressor for less! only my thoughts