It is the very last of the North Star quarts used in the late 1950s to very early 1960s. See bottom row in photo. Yes it is a display quart since the top lid has no oil weight stamped on it. However I believe very few collectors would give you any more for it. Especially since empty quart cans be easily re-lidded these days even with blank lids. Also the number of collectors who only collect full cans are few so I personally wouldn't add a premium to a full can. Most collectors are buying the tin not the contents. I would say retail its worth $50 to $75. Cheers, Don.