Weight 12,1 g; diameter 24,2 mm, thickness 2,8 mm.
This is totally similar as British East Indies 1 Duit 1813 km# 244, except the weight. My coin is about double compared to the one we have in Numista. This coin does look real. Is this another coin?
Your coin - weight 12,1 g diameter 24,2 mm thickness 2,8 mm
Numista - weight 6,07 g diameter 24,5 mm thickness 2,0 mm
Difference - weight 6,03 g diameter 00,3 mm thickness 0,8 mm
The increased diameter combined with the extra thickness of the coin would account for the extra weight. It appears a little odd that the dimensions of the coin could be that far out?
I guess your coin, the heavier one, is not made of Tin like it should be, but made of Lead, what, to me is the only possible explanation for the extra weight. The specific weight of tin is 7,3 and lead 11,35...
If my coin, 12.1 g, is made of lead, is it then not authentic or is it totally different type, which is not added here? I tried to search similar ones but didn't manage.
I suggest you do a XRF-test on it, that is the only way to be 100% sure about the metal-content.
For me, the only way to explain this big weight is the fact that is made out of lead.
The difference between lead and tin is very difficult to see for the unexperienced eye.
And because your coin's diameter is a bit smaller than it should be, it is maybe cast. Lead is very easy to cast.
XRF-test is expensive and I don't have equipment for that so I made density test we have here on Numista. I got a result of 10.46. Tin should have been somewhere near 5.8 and lead should be 11.3. So I believe my coin is lead which some amount of other metals. I calculated that if my coin has 85 % lead and 15 % tin, the density would be apprx. 10.5.
The main question is still, what type is my coin? And has any other member found similar coins?
Hello, how do you mean XRF-test is expensive? Go to a major scrap-dealer, they will definately do it for free, it will only take 1 or 2 seconds.
The density of tin is 7.3
I fear your coin is fake, or maybe made like that, original in the mintfactory, because it is hard to see the difference between lead and tin, so maybe somebody made a mistake that time...
With this dimensions it is impossible to be pure tin.
However, a mint mistake of metal composition wouldn't account for the notable difference in the thickness of your coin, being almost half as thick again as it should be, would it?
