There is a simmer plate, though I got mine aftermarket. Coleman began advertizing the 530 while the war was still going on, but didn't begin selling it until after it was over. I've often wondered if the easy availability of (cheap) surplus 520s is why 530s were only made for a couple years. (Well, that and the return of Swedish stoves to the US market.) ....Arch
@shagratork Had time to make a simmer plate today. Made from a scrap piece of stainless thanks again for the diameter.