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Sorry, not what I meant. I just thought that the iwasaki's being more recent people knew. Eastern smooth blog had a couple of models and what they meant. That's all.

Ok, I read somewhere the m is less hardend. So was wondering if anyone knew. :)

Here you go http://uploads.tapatalk-cdn.com/20160622/414d386a3ae8611b35596e9ea89e9719.jpg

Let me know what you think?

Question, what does the 50 means? I found a stamp with a 50 in it.