All About Pocket Knives

I brought a 3 7/8" Pearl Tobacco Congress.
Can anyone explain what the difference is between a BKC#75 -292 made, a BKC#80 -6 made, and a BKC#83 -1 made. They all have the same specifications.

BK#75 = Back blade etched "PIT BULLS"
BK#80 = Has one odd short blade
BK#83 = Both blades etched tobacco

Bob

Thanks again, Bob.