Brass Threepences were first minted in 1937, they ran alongside the Silver Threepences for the first few years, but from 1945-1967 they were the only Threepence struck.

Brass Threepences were the UK's first 12 sided coin, strictly speaking these coins were made from Nickel-Brass (79% Copper, 20% Zinc and 1% Nickel). The Brass Threepence weighed 6.6 grams and the diameter was 21 mm across the sides and 22 mm across the corners. 
Please see our Threepences in Brass Coins for sale below:

Threepences (Brass)

Item	Date	Description	Grade	Additional Desc	Price
Threepence (Brass)	1950	Proof	FDC		£44.00	Buy
Threepence (Brass)	1951		AVF		£9.50	Buy
Threepence (Brass)	1951	Proof	FDC		£49.50	Buy
Threepence (Brass)	1953		BU		£4.00	Buy
Threepence (Brass)	1953	Proof	FDC		£15.00	Buy
Threepence (Brass)	1954		UNC		£7.50	Buy
Threepence (Brass)	1955		UNC		£7.50	Buy
Threepence (Brass)	1956		AUNC		£15.00	Buy
Threepence (Brass)	1957		UNC		£9.50	Buy
Threepence (Brass)	1958		AUNC		£15.00	Buy
Threepence (Brass)	1960		BU		£4.00	Buy
Threepence (Brass)	1961		BU		£3.00	Buy
Threepence (Brass)	1962		BU		£4.00	Buy
Threepence (Brass)	1963		BU		£2.00	Buy
Threepence (Brass)	1964		BU		£4.00	Buy
Threepence (Brass)	1965		BU		£2.00	Buy
Threepence (Brass)	1966		BU		£2.00	Buy
Threepence (Brass)	1967		BU		£2.00	Buy
Threepence (Brass)	1970	Proof	FDC		£7.50	Buy