AIRQ-1
AIRQ-2
AIRQ-3
AIRQ-4
AIRQ-5
AIRQ-6
AIRQ-7
AIRQ is an abbreviation for Alaska Indian Round Quarter. Six examples are dated 1901, and one (AIRQ-7) is dated 1860. The usually seen variety is the Head Left AIRQ-6. Six Head Right varieties exist, and all are very rare. It is possible that the Head Right varieties were all rejected prototypes.