Earlier this year, Reaper Records did a second press of the Turnstile 7 inch. 300 on black vinyl. They ran out of covers at some point and had to print up some extras. To keep things interesting, they went with an alternate green cover, splitting the second press between 168 with the inital blue cover, and 132 with the new green one.
This actually reminds me that I still need the pre-order cover for this. I'm going to have to set up an automatic ebay search to alert me when someone puts one up.