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I can't carry a tune in a bucket. The guy gave me the razor to make me quit singing.

SO far, both me buccaneers are still on the sides of me buckin 'ead. ;)

Blade shape primarily. If you look at your razor, you can see that the tip of the "M" is ground off. Same with mine. Check the stabilizers front and back and see if they match perfectly or are a bit...

I suspect that may be a re-grind.

I have one similar.
http://i658.photobucket.com/albums/uu303/Wullie_01/MY%20RAZOR%20STUFF%20II/WadeandButcher003.jpg