I do know that a new blade swap (knife has to be sent to CRK) is about $135. I have an older (regular) small Seb. without thumb notches and have never seen another like that. It's not a user, so it's no biggie, but I like the TNs on my user.
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Pat Remele
RKS#4413
SHAG# 8
RKCC# CM096
NRA Member