Exotic Pets 60s Stamp - Perforation Variety

The 60s stamp of Exotic Pets issued on 5 February 2013 have two types of perforation size - P12 and P13.5. If you are not sure how to measure the perforation size of this stamp, you may just count the number of pin holes at the horizontal edge of the stamp. The stamp with perforation size 12 has 17 pin holes at the horizontal edge while the stamp with perforation size 13.5 has 19 pin holes at the horizontal edge. Now you may dig out your stamps and start counting to see if you have stamps with both of the perforation sizes. If you have not, then you may start hunting for it!

left: perforation size is 12; right: perforation size is 13.5