Case numbering

[newandwondering]

ok I kind of understand the Case numbering system but I have a question. Case numbered using 4 numbers.
first number for the handle
second number for the number of blades
third and fourth for the model

I have a knife that is stamped BK254.

Can anyone tell me what the BK stands for?

Thanks

[knfcollector]

Sure its not B6254? In any case I'm guessing that BK would stand for slick black or jigged black composition.

[miked32]

B - Imitation onyx