Greetings! I have what appears to be an almost new, stainless steel single six magnum convertible cylinder. It has the number 9,6,9 engraved in it, as well as a small number 2. I will include some extra photos, and would appreciate if anyone might be able to give me an idea of what it’s worth, or even better be interested in purchasing it. If anything, please make me an offer, Thanks!