Thank you!
And I had the same thought - but clearly 'Americaness' was a selling point for Archie, judging by the fact that they kept the banners at the top and bottom of the cover as well.
Confusingly, the pence version of a nickle is 6d (sixpence) rather than 5d, as the equivalent to a dime was a shilling (1/-), which was 12 pennies. There was a small silver coin for 6d, but 5d would have been five pennies. The old currency system based on multiples of 12 and 20 ( 20 shillings = 1 pound) was tricky to do change with!