COINWEIGHTS FOR ENGLISH                     GOLD COINS                |
THE GUINEA
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Guineas coined prior to the commencement of the reign of the King (ie before 1760) |
    Coin | Value | Weight    |
    One guinea | 20s   0d | 5dwt 3gr    |
    Half guinea | 10s   0d | 2dwt 13½gr-13gr    |
    Quarter guinea | 5s    0d | 1dwt 6¾gr     |
Guineas coined during the reign of the King and prior to the 1st of January 1772 |
    One guinea | 20s   6d | 5dwt 6gr    |
    Half guinea | 10s   3d | 2dwt 15gr or 14gr    |
    Quarter guinea | 5s   1d | 1dwt 7gr    |
Guineas coined since the 31st of December 1771 |
    One guinea | 20s 10d | 5dwt 8gr    |
    Half guinea | 10s   5d | 2dwt 16gr    |
    Quarter guinea | 5s   2d | 1dwt 8gr    |
New Coins |
    One guinea | 21s 0d | 5dwt 9gr    |
    Half guinea | 10s   6d | 2dwt 16½gr    |
    Third guinea | 7s   0d | 1dwt 18gr    |
    Quarter guinea | 5s   3d | 1dwt 8¼gr    |