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 Replies: 8 / Views: 1,987 |
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New Member
Taiwan
9 Posts |
Hello everyone :) I found this Portrait Potosi 8 Reales recently and I would like to ask some questions for overlaps. This coin weighs 26.7 grams I think there's no doubt with this number. The nice straight parallel edging mill with rectangles and circles looks genuine but I'm wondering it's there any issues with overlaps? It's there any possibility that it could be forgery due to poor quality of edge on picture #2 and flat edge on picture #3? Any recommendations are appreciate :) Obverse & Reverse:   Edge & overlaps:     Edited by K35889k35889
03/19/2020 12:28 pm
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Pillar of the Community
United States
1156 Posts |
This one is likely a forgery. I think the long section of edge overlap and sections of missing dentils are an indication that the edge was made after the surfaces were struck.
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Pillar of the Community
United States
1962 Posts |
Jack, note that the section around 7 o'clock obv where the denticles kind of evaporate (as we go counter-clockwise) is exactly where the overlap is...
Even with Mex. City pieces, we observe that the edging process sometimes seems to have distorted the planchets.
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Pillar of the Community
United States
1156 Posts |
Ok, I can see that the coin edge is thicker through the area where the dentils are visible and thinner where they disappear. That could be due to a blank of uneven thickness, but even so, the edge should have been upset to allow some thickening of the rim to show some dentils there, assuming a regal process.
I still thinking it looks like a non-regal process for the appearance of the edge and rim.
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Pillar of the Community
United States
5362 Posts |
Remember how the edge was applied. Two parallel flat (straight) bar die which the planchet rolled between. After half a turn the whole edge design is applied.  Critically the two overlaps must be opposite one another and of equal length. Here one lap is considerably longer than the other. That is impossible using a normal casting machine (edge mill). |
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New Member
 Taiwan
9 Posts |
First able appreciate for everyone's reply & suggestions! Here is my Peru 1788 Lima 8 reales. With the two laps how exact it looks like with Swamperbob's provides picture Laps 1:   Laps 2:   Edge:  The laps looks genuine for me, but I'm wondering it's usually normal with the big gap between rectangle and circle compare with Mexico Mint reales. Edited by K35889k35889
04/13/2020 12:22 pm
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Valued Member
United States
97 Posts |
Question: I understand overlaps and they should be opposite each other but I see no reason for an "overrun."
Question: This coin looks die struck. What would cause the line on the edge that appears inside the rectangles and circles.
Question: I think the posters have agreed that this coin is genuine. Am I correct?
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Valued Member
United States
97 Posts |
What causes the raised line in the middle of many of the edge devices?
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Pillar of the Community
Austria
566 Posts |
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Replies: 8 / Views: 1,987 |
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Posted 03/23/2020 5:55 pm
