Thats a copy of a P-51. There are two versions of the coghlans copy of the P-51, the one you want is the version with two stripes pressed in to the metal. This makes the can-opener much stiffer and prevent if from bending.

The p-38 is smaller which makes it slightly handier to carry and very handy for prisicion field DIY. The P-51 is much faster and easier with cans, but a little to large for mine filed DIY jobs.