You are asking about a 1 Farthing (or 1/4 Penny) coin from Great Britain (KM#843). The coin is 20mm in diameter, made of bronze, and weighs 2.800 grams. The obverse (front) has a portrait of King George VI facing to the left, and the words "GEORGIVS VI D:G:BR:OMN:REX F:D:IND:IMP." (abbreviated Latin for "George the Sixth, by the Grace of God, King of All Britain (or "All Britons"), Defender of the Faith, and Emperor of India"). The reverse (back) has an image of a wren facing to the left, with "1940" above and "FARTHING" below. 18,360,000 such coins were produced in 1940, as well as a small number of example in Proof for collectors.
According to the Standard Catalog of World Coins, an example is valued at US$0.10 in Fine condition, US$0.25 in Very Fine condition, US$0.50 in Extremely Fine condition, and US$7.00 in Uncirculated condition. An example in Proof would be valued at about US$600.00.
The wren.
It's a wren
The 1937 to 1956 British Farthing features a wren on the reverse. All documentation refers to nothing more than simply "Wren". It is suggested by one source that the designer, Thomas Humphrey Paget, probably did not know the type of wren himself, and merely engraved a wren from a picture.
The image on a British Farthing was - From 1937 to 1956, it was a wren. From 1672 to 1937, it was various representations of Britannia.
No. BUT...a wren did on the back of a modern 20th century farthing.
A farthing was 1/4 of a penny.
The last British Farthing was minted in 1956.
The farthing was last produced in Great Britain in 1956.
Farthings were not minted from silver, only bronze in 1901. If you have a silver Farthing it would be because somebody has plated it. Modified coins have no collector value.
1p
The last British Half-Farthing coin was issued in 1868.
There was no 1831 Third-Farthing coins minted. The Third-Farthing coin was produced for use in Malta.