Here are some recent eBay sales. http://search-completed.ebay.com/se...action=compare&copagenum=1&coentrypage=search
Like Bruce said, If it has an original Stant cap under it it's a 'gennie', but those have been reproduced for ages, and most now are imports. My 'A' had one of the original quails on it when my dad bought it in 1962, but he traded that to a friend who has an original quail on all his 'A's and put a greyhound on it around 1970.