Think the frame is 531ST but it doesn't have a sticker.
I think it's safe to assume that any Galaxy with normal sized tubes is 531, they made them from that for about the first 3 millennia of production before switching to oversized tubes.
@gbj_tester started
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I think it's safe to assume that any Galaxy with normal sized tubes is 531, they made them from that for about the first 3 millennia of production before switching to oversized tubes.