1.68 Milimeters
Bronze
The thickness of a penny is approximately 1.52 mm.
Millimetres to 1 decimal place (or micrometres rounded to the nearest 100).
There was never an Australian pre decimal coin (pre-1966) minted with a Koala on the front, back, or anywhere else.
Pre-decimal British Pennies were made from bronze from 1860 until 1967.
The old penny, specifically the British penny, was first introduced in 785 AD during the reign of King Offa of Mercia. Over the centuries, various designs and materials have been used, but the term "old penny" often refers to the pre-decimal penny that was in use until the decimalization of the currency in 1971. The old penny was replaced by a new decimal penny worth one-hundredth of a pound in that year.
The height of a penny is the thickness: 1.55 mm (millimeters)
The decimal value is 0.080
Half a penny in decimal form is 0.005
19mm, Thickness is 1.55mm
1.55mm at the rim
A decimal halfpenny is written and was spoken as it sounds here - it is no longer in-circulation in the UK. The pre-decimal halfpenny was also written as one word, but was spoken like: "hayp'nny."