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".
In some cases, declaring a die defect an "error" is determined by the severity of the defect. For example, die wear is usually not considered an...
I consider clashed dies, die cracks, die breaks, etc. to be "die errors". Since they're not supposed to be there they are consequently "errors"....
It's a strike-through error, but I can't establish the identity of the obstructing material with any certainty. It could be "grease", since...
Grease strike. You'll note a faint incuse "ghost" of Lincoln's bust within the larger grease-struck area. This is where the grease flowed toward...
Considering how battered the reeding is, I'd say post-strike damage.
It's a type of broken collar. Specifically, it's a bilateral split collar. No part of the working face of the collar has broken off. Instead,...
I know the coin with the thick-appearing edge is the allegedly underweight specimen. You can find normal-weight coins with this appearance in all...
Without an accurate weight your observation that the coin is unusually light must be evaluated with a degree of skepticism. The edge view...
This coin was altered outside the mint. The edge, which is concave in vertical cross-section, indicates that the coin was probably encased in a...
Yep. It's a lamination that folded over before the strike. Nice one.
It's a well-known shattered die that incorporates a 50% retained cud. Its value is somewhere around $125, judging from eBay prices (which vary...
Up until 1990 the mintmark was punched into each working die by hand. So its position and orientation will vary.
The smaller strike shows a straight edge. That's characteristic of most chain strikes.
That make sense if you equate "strike" with "downstroke". I keep the two concepts separate. A saddle strike involves one downstroke and two...
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