James I, Unite 22 Shilling Coin Weight by Briot ND

Reverse

Crown above denomination

Script: Latin

Lettering:
•XXII•
•S •B•

Translation: 22 Shillings

Engraver: Nicolas Briot

Edge

Plain

Comment

PROCLAMATIONS CONCERNING THE WEIGHTS.
JAMES I.
Ruding Vol. I, p. 374, sub anno 1617-18, July 31st.
[Referring to the recent coins.] And that all subjects might have good and just weights for the weighing of such coins, notice was given in the proclamation, that his majesty had commanded the master of his mint within the Tower of London (the appointment thereof being proper and peculiar to his majesty only) to prepare, before the first of September, a sufficient number of upright balances and true weights as well of every several piece of gold lawfully current in the realm, as of the said remedies and abatements, to be ready to deliver at reasonable prices (to be rated by the commissioners of the treasury or the treasurer of England for the time being) to all such as should require the same. And the chief officers in all cities, boroughs, and towns corporate, in the realm of England, and principality of Wales, were commanded to provide, to have one pair of the said weights sufficient, at the hands of the said master of the mint, within every city, etc., before the last day of the said month of September, these to be well and safely kept, for trial of the weight of the said coins, as any occasion should be. And all persons were forbidden to have or use
any other weights than as aforesaid, for the said coins of gold, remedies or abatements...

 The sovereign weight with the king's half length bust in armour on one side, with lettering I.R. MA. BRI., and xxii. crowned on the other is known, both with the bust in ornamental and plain armour.
http://www.britnumsoc.org/publications/Digital%20BNJ/pdfs/1909_BNJ_6_14.pdf