Vintage T-Shirt Forum & Community Authentication Appraisals

I wasn't sure what section of the forum to put this in.

I saw a bull shirt at work a couple weeks ago, (see the one in the middle) and had assumed that it was a 70s "destination" tee.

http://s275.photobucket.com/albums/jj29 ... C00327.jpg

I was looking at Koshercollectibles today and saw that he also has one http://cgi.ebay.com/RARE-VINTAGE-1960s- ... 2a02d5b5da but dates it to the 60s. Are these shirts special/notable for some reason?

Edit: On the Bull Shirt website it says that the company started in 1980. How confusing.

I'd categorize this as a "vintage novelty tee" produced in several variations throughout the 70's and 80's:

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0176648988" onclick="window.open(this.href);return false;
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0166483974" onclick="window.open(this.href);return false;
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0176621119" onclick="window.open(this.href);return false;