ChrisUnionNJ
Experienced Member
I has 2 GS's I think one is a rom0 then I saw A upgrade to a rom1 on ebay https://www.ebay.com/itm/254599602778?hash=item3b4751a25a:g:YggAAOSwz7NfW-b9
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Per above, it would be pretty surprising to actually have a Rev0 ROM in your machine; if you upgrade the machine you'll want to hold onto the chip you pull out because it's kind of a collector's item. (Not because it's good for anything but, yeah, rare.) A ROM0 will have Apple part number 342-0077-A on top of the chip; if it says -B then you're already upgraded.
(If you're just guessing based on the case, well, I know lots of sources claim that most "Woz" IIgs-es are ROM0, and maybe they were when they were sold, but all three of the ones I've seen in the last decade were ROM1-ed already.)