Busse Old School A2 or INFI Question

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A question about the old school busse knives . I have two shba and one looks smooth and the other has dimples under the paint . Both are smooth bolt fatty and have the same straight up plunge line . Is it dimples or plunge cut that says its A2 or INFI ? Thanks for your help .
 
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The A2 knives do have a different plunge line, and do sometimes show dimples. There's only two concrete ways to discover steel type: Send it to the shop for verification, or take a gun blue pen and make a mark on the blade edge grind, if the blue sticks then you have A2. Be sure to remove any oils from the steel first.

The handles of the A2 knives were normally blued where the steel was ground flush with the handle material, if your knives are unused you might see the remnants of that blue. My Mean Street has most of the bluing intact, but my other two have worn off.

INFI knives tended to have a very wide ricasso (handle to plunge line) A2 knives tend to have narrower ricasso. But again, this is variable, all the older knives are hand made thus all have minor differences.

The handles are smooth bolt, which is a good indicator of A2, but I have seen smooth bolt INFI. One of the grail Battle Mistress's has smooth bolts.
 
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