These caps don’t come up all that often, but when they do, they are extremely expensive!  This cap is an affordable reproduction of the original made out of similar materials.  There are also stainless steel reproductions available from a different manufacturer; however those range in price from around $500-$1000 (depending upon where you buy them).

Actually, come to think of it, I have one of these earmarked for my Austin….

Click here for the listing: american austin Radiator Cap Hood Ornament Mascot