i don't see them for sale much online or anything, but i've seen quite a few in the shop. they're marked a little more discretely than some other companies with a huge X on them somewhere. they're marked with a little 2 in the lower part of the B, just engraved, no fill like the serial.
there's a guy in my area that used to have hundreds of them for sale. haven't heard from him in a while though.
Matt
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2006 AMF300 Advisory Staff