Albert You ask about the value of counterfeits.
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I suppose it has to do with quality and the amount of silver remaining (as a guess).
The issue is quite a bit more complex.
The quantity of silver has little to no bearing on the value of counterfeit silver dollars to collectors familiar with the topic. Many of the most common counterfeits are those that are very high in silver content.
Quality (condition) is also a poor indication of value. In many instances it is only very common types of counterfeits that are found in high grades.
The most collectable counterfeits are coins that actually circulated and which were made for circulation. The forgeries made to decieve collectors are of almost no value over intrinsic value. So I will limit my comments on value to actual circulating contemporary counterfeit coins.
Rarity of type is paramount. I will try to illustrate using Spanish American types because those are my primary area of expertise.
Among Mexican 8 reales the relative order of value is:
Iturbide are rarest
Hookneck
Portrait Charles III
Portrait Ferdinand VII
Portrait Charles IIII
Cap and Ray - First Republic
Cap and Ray - Second Republic are most common
Within each type of Counterfeit there is an order of value by method of creation:
Struck from engraved dies with serious errors are best
Struck from engraved dies
Struck from transfer image dies
Cast from engraved or carved molds
Cast from transfer image molds are of limited value
Finally there is an overlapping consideration of the materials used;
Sheffield Plate on Copper (only struck) Best
Sheffield Plate on German Silver (only struck)
Debased Silver
Copper with a Silver amalgam or paint
Base metal electroplated
Zinc alloys, tin alloys and white metal. Worst
The final ranking would pertain to the denomination.
8 Reales are the most common
2 reales are second
1 reales are third
4 reales are fourth
1/2 reales are fifth
1/4 reales in silver are the least common
Those are rules of thumb and pertain to sales among experienced collectors. Novices typically get this wrong.
Interest level and collector base is of course very critical as well. There are hundreds of collectors interested in British and Irish half penny colonial counterfeits, so the prices are higher for coins that would be considered common in other series. The fact of the matter is that there are relatively few counterfeits in existance and the number clearly decreases with age.
I hope that is clear, but the best teacher is experience.