Imperial Prov. USA dating chart?

[TripleF]

Just acquired this beautiful Imperial knife:



I'm wondering if there is a dating chart using the numbers on the blade to tell the age.....similar to the way Zippo lighters are coded.

Any help would be greatly appreciated.


BTW, the numbers on this knife are:
2170537
2281782

[robinetn]

http://www.allaboutpocketknives.com/kni ... rt#p148353

Is this what you need ? (scroll up the page)

Bob

[TripleF]

very helpful thanks!