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PMFJI --

There are several Schick identification guides (some with pictures) on the Internet. Here's one summary, which has some references:

http://wiki.badgerandblade.com/Schick_Injector
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You did well on the package.

. . . Use less pressure on the razor, for your next shave, and you'll have fewer cuts.

It could be that you're catching the corners of the blade, as well, but...