Have you seen a Chalmers Shilling of any variety that was as original as this piece AND as well centered? I have not in about 30 years worth of looking, and so when I saw this coin I bought it! I also think this coin is a bit undergraded, but I did not want to resubmit it and lose the old green holder.
The "worm" is the squiggly, vertical line between the two birds, NOT the horizontal snake in the upper half of the circle. A quick way to tell the difference between the two varieties is to look at the worm: on the "Long Worm" variety, the worm is heads-up while on the "Short Worm" variety, the worm is upside-down. Both varieties share the same reverse.
Many (perhaps all) of the Short Worm examples have a raised die line connecting the S of SHILLING with the head of the bird on the left. They may also show a raised die chip just below the tail of the snake.
Joseph J. Mickley Collection - W. Elliot Woodward 10/1867:2531 (as “Perfectly uncirculated...”) - Frederick Stanton Perkins - Robert Perkins, from the previous owner in 2/1881 - Ted L. Craige Collection - Stack's/Bowers 3/2013:204, $49,938
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