No ! product of slippage
This is from an article in
Coin World and what it is saying it is called is slippage
not dropped lettering.
Sometimes an error would occur when placing the lettering on the coins. Slippage of the edge-lettering equipment could produce a partial or complete overlapping of words on the coin. A half dollar, for example, with such a garbled edge inscription as FIFTY CENTS ORLF A DOLLAR is a product of slippage, and is definitely a Mint error. Such overlapped letters on the edge of the
capped bust half dollar are common.