That 1 Rentenmark note is earlier issue, issued somewhere around 1924-26 IIRC. That's much more scarce than the 1937 issue, that is frequently being sold on eBay. I do not have my books at hand, but I think this one is a bit more valuable, though the condition is not best possible. I'd still say, like scoutjim99, these are definite keepers!
-JJ-