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Incorrect Weight For 1985 British Virgin Islands 1$

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Valued Member

Canada
191 Posts
 Posted 01/14/2023  06:14 am Show Profile   Bookmark this topic Add recollector to your friends list Get a Link to this Message Number of Subscribers
i have a 1985 british virgin islands 1$ coin, I think its silver. but its weight (22.59g) is not near either the silver one (24.9g) or nickel (28.28g).
diameter is 38.77mm. any ideas what I have? is it struck on an incorrect planchet? or is the composition different?


Incorrect-Weight-For-1985-British-Virgin-Islands-1$
Incorrect-Weight-For-1985-British-Virgin-Islands-1$
Bedrock of the Community
sel_69l's Avatar
Australia
21788 Posts
 Posted 01/14/2023  07:02 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I will assume your scales are accurate. Check against a coin of known correct weight (eg Morgan dollar, weight 26.73 grams)

If that is the case, density test (which also needs accurate weight measurement), should prove either:
1. incorrect planchet in correct alloy,
or
2. fake, if not of correct density for the alloy.

CuNi density 8.91 g/cc
stg silver 10 38 g/cc

CuNi KM#47, Krause does not mention weight,
stg silver KM# 47a Krause weight 24.74 grams, ASW 0.7357 oz.

Krause does not note KM#47 as silver plated, but the coin in these pictures appears to be either silver plated or stg silver. Silver plating would have almost negligible weight.

You have some further investigation and measurements to do.
Edited by sel_69l
01/14/2023 07:04 am
Pillar of the Community
United States
1915 Posts
 Posted 01/14/2023  12:20 pm  Show Profile   Bookmark this reply Add Albert to your friends list Get a Link to this Reply
Stack up four or five Canadian 5-cent coins that are not well worn.
It may be good enough to spot check the scale accuracy.
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