The 2000 years.

The year 2000 had a combination of 5 dots and 5 X's. For the first half of the decade a single dot was removed each year. 2005 knives have 5 X's, and then one of these was removed in each following year. Also Case began making some knives in honor of old family members during this decade.

2000 5 dots & 5 X's

The special Millenium tang stamp only used in the year 2000

2005-The dots are gone

Family tang stamps used on modern knives in the 2000's.