Although I agree with mart about keeping it, I checked Warman's price guide and it doesn't have your size bowl but has a 13" diameter double crimp version that is priced at $120+, ca. 1940s. Comparing the 1940s & 1950s Peach Crest, yours looks like a 1940s. I would guess your bowl is probably worth about half of the larger version I just mentioned. Found a few for sale of your exact kind in the $25-$45 range online, which is low-balling it and why you should probably hang on to it until they are rarer.