Thank you all so much for this opportunity.
My four guesses would be:
1706, as in the steel 0170-6C. Hope that's it.
188, as in the thickness of a BK-7 at .0188"
7, the length
6995, the MSRP of a BK-7 according to Will's first post on it.
If I've misunderstood and I'm only supposed to be giving you one number then go with my first guess of 1706.
Thanks again!