Contact marks can be completely accidental.
While a contact mark would be mirror-image, so would a dropped letter, if the plug of die fill flipped over prior to the strike.
Due to the complexity and subtlety of the error, I can't come to any conclusion without examining it myself under a microscope. Depending on the...
I am always suspicious of dropped letters on high relief areas like the forehead. These can instead be contact marks from the obverse of another...
That area looks like more of a stain. Perhaps the glue layer is unusually thin here, or maybe it came off, leaving a discolored area behind....
Try looking at it under a microscope at a low angle. Focus on the edge of the "strike-through".
Silver, mint set, large letter, quarter -- these factors would have certainly raised the price. When it comes to errors, value is hard to...
Rarity has little relationship to market value. Some one-of-a-kind errors bring very low prices while some relatively common errors bring...
A small dropped letter would perhaps bring $30 - $50 on eBay.
Glue can produce a deceptive appearance. It can make the affected area appear raised or sunken. The reason I think it might be transparent glue...
DoK U Mint, have you excluded the possibility that your coin is perfectly normal and is simply covered by a layer of clear glue? Glue can produce...
I now see how it could be interpreted as the "E" from E PLURIBUS UNUM. Presuming it is the E, the shape looks uncomfortably distorted to be a...
I can't decide if these are conjoined dropped letters or contact marks from another coin. Contact marks are usually strongest on the rim, since...
Here again, there are exceptions. Normal die wear is not an error; abnormal die wear and die distortion IS an error. Die wear/deformation that...
There are two types of machine doubling, "push doubling" and "slide doubling". Push doubling creates shelving at the margin of the design and...
Is the "diving goose" a rotated die error? I haven't heard of any intentional errors of that sort. There are quite a few in-collar double...
1978 was a peak year for the production of intentional errors from the Royal Canadian Mint. I have several and have seen numerous examples over...
Most missing clad errors occur when a clad layer falls off after blanking but before the strike. A few occur when a clad layer falls off after...
It's probably just discolored. The nearly normal weight is inconsistent with a missing clad error.
Rockdude is correct. I use the term "progressive, indirect design transfer".
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