How to Identify the Missouri Centennial Half Dollar

What This Coin Is

The Missouri Centennial Half Dollar was struck in 1921 to honor the 100th anniversary of Missouri's admission to the Union in 1821. Designed by sculptor Robert Aitken, it is a single-year issue known for its rugged frontier imagery and for a notable die variety collectors specifically look for.

Obverse Design

The obverse depicts the bust of a frontiersman wearing a coonskin cap, facing left, meant to evoke the pioneer spirit of Missouri's early settlers. "UNITED STATES OF AMERICA" curves along the top, and "MISSOURI CENTENNIAL" appears below the portrait along with the dates "1821-1921."

Reverse Design

The reverse shows a standing frontiersman in buckskin, holding a long rifle, beside a Native American figure, symbolizing the meeting of settler and indigenous cultures on the frontier. "LIBERTY" and "IN GOD WE TRUST" appear in the design field along with "HALF DOLLAR."

Size, Weight, Metal, and Edge

The coin is struck in standard 90% silver, 10% copper composition, weighs about 12.5 grams, measures roughly 30.6mm in diameter, and has a reeded edge, consistent with other classic commemorative half dollars.

Mint Marks and the "2★4" Variety

All Missouri Centennial half dollars were struck at the Philadelphia Mint and carry no mint mark. Instead of a mint mark, the key identification point on this issue is a small "2★4" mark incused into the obverse field to the left of the frontiersman's neck. Coins with this mark represent an early, scarcer subset of the mintage, struck before the mark was later removed from the working die, and they are worth noticeably more than examples without it. Examine this area carefully with magnification, since the mark is small and can be faint on worn coins.

Telling It Apart from Similar Coins

The Missouri half's frontiersman-and-coonskin-cap obverse is distinctive among commemoratives, so it is unlikely to be confused with other issues. The main identification task specific to this coin is distinguishing the "2★4" variety from the plain variety, since both look identical apart from that small incused mark.

Judging Condition at a Glance

Check the frontiersman's cheek and cap fur on the obverse, and the figures' arms, rifle, and clothing folds on the reverse for wear. High-grade examples show sharp separation between the two standing figures on the reverse and crisp texture in the coonskin cap fur on the obverse; wear tends to blend these details together.

Authenticity Red Flags

Because the "2★4" variety carries a premium, be alert to added or re-engraved marks meant to simulate it — genuine examples show a mark that is part of the original die work, with consistent depth and shape, not a scratch or stamp added after striking. As with other silver commemoratives, also check for correct weight, diameter, and even, machine-reeded edges, and be cautious of unnaturally uniform toning.