4 of a Kind Notes

A 4 of a Kind note contains four identical digits in its 8-digit serial, with the remaining four positions occupied by other digits. Example: 11112345 (four 1s). This is the lowest rung on the "of a Kind" ladder that has meaningful collector recognition — notes with only two or three of the same digit are too common to generate significant market interest in isolation.

Rarity and Context

Four identical digits in an 8-digit serial is not especially rare from a purely mathematical standpoint. Many 8-digit serials happen to contain four of the same digit by chance. The collector significance depends on how the four identical digits are arranged:

• Scattered 4 of a Kind (e.g., 11221311): Less impressive visually, lower premium
• Grouped 4 of a Kind (e.g., 12341111): More visually striking, especially if the group runs are at the start or end
• Double Quad (e.g., 11112222): Four identical digits in the first half AND four different identical digits in the second half — its own distinct category with a higher rarity tier

Interaction with Other Categories

A note with four identical digits might also qualify for other categories: if the four identical digits are in a row (e.g., 12111145), some collectors informally call this a "quad run." This is not a formally recognized PMG/PCGS category but is recognized in the collector community.

Value

Pure 4 of a Kind notes (without any secondary pattern) carry only a modest premium, generally $1–$10 above face value in circulated condition. The collector appeal is primarily as a stepping-stone or a way to document collection of all N-of-a-Kind tiers.