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 Replies: 10 / Views: 3,123 |
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Pillar of the Community
Singapore
631 Posts |
Hi all, does this one look ok ? Weight is 32.4g and 10.1 Specific Density.   |
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Valued Member
United States
414 Posts |
Numister these are always harder to tell if authentic or not, at least for me, based on picture alone. The weight seems reasonable. The coin has been cleaned/dipped which doesn't add to it's sense of authenticity. I do see some areas of concern that would indicate this coin may be a cast copy (of a circulated or weakly struck original). Here is what I'm referring to:  How did you calculate your SG? This Ducaton from Utrecht should have a silver purity of 92%-94% which would imply an SG of over 10.36. While your SG of 10.1 may seem close to the desired number, it actually implies a silver purity of 30% less than the desired 92%-94% range (assuming of course this is a silver alloy to begin with). Still, I would expect most cast fakes to have an SG quite a bit lower than 10.1 so I'm left here to wonder if perhaps there was some error in your SG calculations. Lastly, can you post a few good pictures of the edge. |
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Valued Member
186 Posts |
At a first look it seems right to me!Are those rev. marks due to a brooch being removed?
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Pillar of the Community
United States
1962 Posts |
"rev. marks due to a brooch being removed"
Correct. A Brit collector would recognize that, with how many British-circulated crowns you see these remnants on.
Slightly odd surfaces (presumably connected to having been a brooch or similar), but looks OK. A perfect piece for the scratch-and-dent collector.
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Valued Member
United States
414 Posts |
The brooch mount marks flew completely over my head. I guess I'm so accustomed to them being much more substantial and the damage far more pervasive that I didn't put the two together. Aside from those two spots, I don't really see anything that screams fake.
The SG measurements are off but I believe that's most likely attributable to either inaccuracy in calculation and or approach, or an insufficiently accurate scale.
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Pillar of the Community
 Singapore
631 Posts |
With the brooch removal marks is it considered junk ?
Didn't really notice the marks.
For SG measurements, I placed a glass of water on a scale, dipped a paper clip attached to a string and noted the weight.
Next, I secured the coin onto the paper clip and dipped them in the water and took the weight.
I divided the difference in weight with the weight of the coin. Is this correct ?
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Valued Member
Romania
86 Posts |
SG = (weight in air)/(weight in distilled water)
Not the other way around.
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Valued Member
United States
414 Posts |
Quote:
With the brooch removal marks is it considered junk? The brooch marks are not overly distracting like many others out there and in some ways blend into the coin. If your coin is indeed genuine, I personally don't think it would be junk. It's still a nice coin that would sell well above melt. I think your approach to SG testing is OK and you are obviously dividing the weight of the coin by the weight of the coin suspended in water or otherwise you wouldn't get 10.1. I think the paper clip may cause some of the outage or variation in your SG - try just using thread. The other and probably the most relevant factor is the scale you are using. How accurate is it? |
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Valued Member
186 Posts |
realeswatcher I'm just an immigrant across the channel:))anyway those marks,from my experience(world crowns mainly) generally come from a brooch!
Numister I don't consider it junk,the coin is quite common,not a VOC unfortunately,well preserved and keeps a decent amount of details so personally I would have no problem in having a coin like that.
PS. Disappointed to see that the guy stating this coin is 100% fake deleted his comment!The bottom line is that we're all students,at least I consider myself so and we should accept that judging a coin by a picture could sometimes go against our opinion!
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Pillar of the Community
Singapore
631 Posts |
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The other and probably the most relevant factor is the scale you are using. How accurate is it? How do I test the accuracy of my scale cableguy ? Its a made in China digital scale. I have some weights but they are also made in China.  Quote:
It's still a nice coin that would sell well above melt.
I definitely paid way above melt, its my first Ducaton. Edited by Numister
05/20/2018 04:05 am
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Pillar of the Community
Belgium
1185 Posts |
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presumably connected to having been a brooch or similar similar may have been a typical Dutch way of using taler-sized coins as ornament: broekstukken a brooch like device used during the 17th-19th century in rural places in various provinces in The Netherlands. The idea was to use the talers (and later even bigger silver plates) as items of display in costumes of fishermen and farmers. Is was a sign of prosperity. see CCF thread about this topic http://goccf.com/t/304129This ducaton may indeed have traces that are compatible with such use. Last point is that some broekstukken that survive today were made from contemporary counterfeits (examples shown in the tread). |
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Replies: 10 / Views: 3,123 |
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Posted 05/17/2018 2:15 pm
