There are various date/mints reported with missing initials. The initials were raised on the die an poloishing of the die could easily weaken or remove them. As a simple die polishing error I do not consider them to be very special. It's just a die that should have been retired.
If it's a business strike without the initials it should carry some sort of premium, shouldn't it? Maybe they aren't rare, but there seems like there would be a scarcity factor.
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edited: I guess that was just for the 1941.
Jerry
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Jerry
J