The 30s frog stamp sheet shown below was issued on 3 May 2007. This 30s frog stamp has two types of perforation size - P12 and P13.5 (click here to see the post showing the perforation varieties of the frog stamps). Apart from that, the 30s stamp also has two types of watermark - SPM sideway down and SPM sideway up (click here to read about the SPM watermark). The SPM sideway up is an uncommon type of watermark for this 30s frog stamp. I acquired the SPM sideway up 30s frog stamp long time ago from post offices.
the stamps in this sheet have perforation size P12 and SPM sideway up watermark