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1/4 Anna 1906 British India

 
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Poland
29 Posts
 Posted 02/24/2020  4:45 pm Show Profile   Bookmark this topic Add BRaj to your friends list Get a Link to this Message
Hi!

Today I am presented two coins:

1/4 anna 1906 Calcutta mint copper
and 1/4 anna 1906 Calcutta mint bronze
.

Copper: Actual Weight 6.42-6.56
mintage 47,229,000

Bronze: Actual weight 4.76-4.99
mintage 115,786,000

To differenciate:

A) coins minted in copper are thick while lminted in bronze are thin .

B) copper is more yellowish while bronze more reddish orange

Robert



Bedrock of the Community
Australia
16672 Posts
 Posted 02/24/2020  5:45 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I have never been able to figure out why
MS red or red/bn examples of 1/4 ANNA's Victoria to George V1 are relatively easy to find.

With these:-
copper:-
all of the beard detail is there, so no wear,
MS-63 red/bn, COMMENT:- obverse 'carbon' staining,
bronze:-
all of the beard detail is there, so no wear,
MS-61 red/bn, COMMENTS:- scratch above and behind ear (obverse), 'carbon' staining (reverse).
Bedrock of the Community
Australia
16672 Posts
 Posted 02/24/2020  5:51 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I have never been able to figure out why
MS red or red/bn examples of 1/4 ANNA's Victoria to George V1 are relatively easy to find.

With these:-
copper:-
all of the beard detail is there, so no wear,
MS-63 red/bn, COMMENT:- obverse 'carbon' staining,
bronze:-
all of the beard detail is there, so no wear,
MS-61 red/bn, COMMENTS:- scratch above and behind ear (obverse), 'carbon' staining (reverse).


Very interesting about the different metals.
1906 must have been the changeover date from copper to bronze.
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Spain
1767 Posts
 Posted 02/24/2020  6:15 pm  Show Profile   Bookmark this reply Add Palouche to your friends list Get a Link to this Reply
@BRaj...Couple of nice coins there.



Quote:
Very interesting about the different metals.
1906 must have been the changeover date from copper to bronze.

The first dated coins of Edward VII were in 1903. For 3 years these coins were minted from Copper but in 1906, due to the increased price in Copper, they were substituted with Bronze. All were minted at Calcutta.
As you can see in 1906 all 3 denominations were minted using both types of metal the only distinguishing factor being weight and thickness...
First..
1/12 Anna
Calcutta Mint..No Mintmark...
Copper..1903-1906 = 17.5mm diameter....*2.15gr (thick planchet 1.32mm)...Edge plain....KM#497...
Key date 1903 lowest mintage 7,883,044
Bronze..1906-1910 = 17.5mm diameter.....1.64gr (thin planchet 1.22mm)....Edge plain....KM#498...
Key date-1909 lowest mintage 12,316,800
Second..
1/2 Pice
Calcutta Mint..No Mintmark...
Copper..1903-1906 = 21.0mm diameter...3.2gr (1.42mm Thick Planchet)....Edge Plain...KM#499
Key date-1903 lowet mintage 5,376,000
Bronze..1906-1910 = 21.0mm diameter...2.4gr (1.37mm Thin Planchet).....Edge Plain...KM#500
Key date-1906 lowet mintage 5,859,769
Third...
1/4 Anna
Calcutta Mint..No Mintmark...
Copper..1903-1906 = 25.5mm diameter...6.5gr (1.55mm Thick Planchet)....Edge Plain...KM#501
Key date-1906 lowet mintage 47,228,800
Bronze..1906-1910 = 25.5mm diameter...4.8gr (1.50mm Thin Planchet).....Edge Plain...KM#502
Key date-1909 lowet mintage 29,966,071
New Member
Poland
29 Posts
 Posted 02/24/2020  6:55 pm  Show Profile   Bookmark this reply Add BRaj to your friends list Get a Link to this Reply
sel_69l, thank You for your grading! Do You know what I can do to clean or conserve carbon staining?

Palouche, thank You for your the best explanation!
New Member
Poland
29 Posts
 Posted 02/24/2020  6:57 pm  Show Profile   Bookmark this reply Add BRaj to your friends list Get a Link to this Reply
Ps. 1/4 anna 1906 coppee is the thickest quarter anna from all my ;) its weight 6.55g.
Bedrock of the Community
United States
19391 Posts
 Posted 03/10/2020  2:10 pm  Show Profile   Bookmark this reply Add IndianGoldEagle to your friends list Get a Link to this Reply
I would recommend you don't do anything to remove the carbon spots. It will only make them look worse and drop the value of the coin.
Bedrock of the Community
Australia
16672 Posts
 Posted 03/10/2020  5:13 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
Don't know how to get rid of the 'carbon' stains.

They are not really 'carbon', but actually
a water insoluble inorganic complex of copper oxide / sulfide heavy localized toning.

Cannot be removed by acetone.
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