Do any of you know?
 

I see these plates frequently on ebay. Do any of you know the year they were produced?

http://cgi.ebay.com/1950s-Kettlespri...item53e1eb8c98

Aside from it stating 1951 in the ebay listing, Hunt Auctions has also listed them as 1951.

http://www.huntauctions.com/online/i...=390&lot_qual=

I found a directory of all plates by this manufacturer. This plate doesn't have a date listed for year of production, but the other commemoratives were made the year they feature, so these probably were as well.

http://home.earthlink.net/~kettlespr...esignlist.html

http://home.earthlink.net/~kettlesprings/oldstuff.html