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I'm going to keep an eye on it out of curiosity to see what it sells for/if it sells.
I contacted Tusa they did confirm it is the RS-530 and SS-20 regs. I cant say that im disappointed with these regs as a backup, they breathe fine and havent given me any problems, but i did inherit them from someone else and am not sure the last time they were serviced. I figured i would get rid of them and get a newer set for my dive buddy (GF)