The handle configuration (pattern of brass, red, white, + brass spacers) shows them to be 1997-2001 Marbles knives. Each year from 97-01 used a specific pattern of spacers for that year only. I'm not sure the exact year, there's a chart of this online somewhere if you search.
Anyway, they're usually made with 52100 steel, laser engraved (not stamped) logos, small hand guards, etc. The larger ones were made from 5160, but those usually have the large style guard (like the 2 Trailmaker knives in the pic)
The 97-01 Marbles were, IMO, the best ones ever made. Unfortunately, they are no longer made. After Mike Stewart left Marbles in 01 to from Bark River Knife + Tool, quality at Marbles went way down.
Not all the knives in the pic below are Marbles, but the ones that are are all 97-01 series. Based on the handle config, I'm guessing yours is the same year as the second and third knives from the bottom-right.
(edited for grammar)
Update: I think it was made in 2000. I found a Marbles knife for sale with the Black-brass-white-red(1)-white-brass-black spacer pattern. The seller dates it as made in 2000.
Here:
http://northwoodsknives.com/marble-outdoors-knives/marbles-fieldcraft-/-walnut/prod_930.html
