How to Identify the Arkansas Centennial Half Dollar (Robinson)

Start with the portrait side. A genuine Arkansas Centennial (Robinson) half dollar shows a single right-facing male bust identified as Joseph T. Robinson. This one-portrait design is the fastest way to separate the Robinson variant from the regular Arkansas Centennial half dollars, which instead show a paired Liberty head and Native American on that face. If you see two conjoined heads rather than a single named senator, you are looking at the standard Arkansas issue, not the Robinson.

Check the other side for the eagle. Both the Robinson variant and the regular Arkansas Centennial coins share the same spread-eagle design with state and centennial lettering and the 1936 date. Note that the eagle side carries the statutory inscriptions, which is why collectors debate whether it is technically the obverse or the reverse — either way, the eagle-plus-Robinson-portrait pairing is what confirms the type.

Verify the physical specifications. The coin is a standard half dollar: roughly 30.6 mm in diameter, about 12.5 grams, struck in 90% silver with a reeded edge. A calibrated scale and calipers are the best tools; a piece that is off in weight, diameter, or edge reeding for a silver half dollar is a warning sign.

Expect no mint mark and only the 1936 date. Every genuine example was struck at Philadelphia in 1936, so the absence of a mint mark is normal. Any Arkansas-Robinson half dollar bearing a mint mark or a date other than 1936 should be treated as suspect.

Be cautious with authentication, since scarce commemoratives attract counterfeits and altered coins. Watch for mushy or doubled lettering, tooling in the fields, incorrect weight, or a color that does not match 90% silver. For any higher-value purchase, rely on reputable dealers and third-party grading (PCGS, NGC) rather than eye appeal alone.