I later found out i say size instead of weight after I finished doing the video and editing. Forgive me on the small mistake.
Technical Specifications:
Diameter: 23.5 mm.
Weight: 5.65 gm.
Composition: Copper -Nickel.
Edge: Milled.
Mint: Royal Mint England , with KN mint mark - King's Norton, Birmingham Mint , With H mint mark - Heaton's Mint, Birmingham
Year & mintage:
1954 -10,000,000 pcs.
1956 -5,000,000 pcs.
1957H -5,000,000 pcs.
1957KN -Inc in 1957 pcs.
1961 -55,000,000 pcs.
1961H - Inc in 1961
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