If its real then its a GREAT find. The size is right. I've never seen this sign in this size reprinted. Their is a bigger version on poster type paper that you see pretty regularly. Exhibit A-
http://cgi.ebay.com/LOUISVILLE-SLUGG...lenotsupported
Several items from the Halper catalog have been reproduced, so being that this sign was in the catalog throws up a red flag. Its just too tough to tell from the photos. Look closely at the image in the catalog. Look for any consistencys of damaged areas. Take a look at the bottom of the T in "The" and the secong g in "Sluggers" and under the A in "ask". It appears that there may be some small damaged spots in both yours and the image from the Halper catalog.