7th July 2003:

A few days ago Geoff Raynes of Kalgoorlie WA discovered a hitherto unpublished variety of the 1920 penny. The reverse features a dot over the lower scroll but the obverse is the London die pattern. The mere existence of this coin could lend some support to John Sharples' correlation of the reverse dot configurations to the two Australian mints.

The discovery of this coin some 83 years after it was minted suggests that the study of Australian Commonwealth coinage has not yet reached the point where everything is known.

13 July 2003

A second specimen has been found by Peter Andrews in Melbourne. Peter notes that there are significant differences between the coin that he found and the one discovered by Geoff Raynes, suggesting that at least two reverse dies were used.

• No dot
  
• Dot under lower scroll
  
• Dot over lower scroll
  
• Double-dot, i.e. dot under lower scroll and dot over upper scroll
  
• Dot over upper scroll
  

The various combinations of dies and dots yield at least eight varieties. Since this would yield an excessively wide table I have split off the London obverse combinations.

London obverse

Designation	P20M-1C-//	P20M-1C-//.	P20S-1C-/./
Obverse	London	London	London
Reverse	Calcutta	Calcutta	Calcutta
Dots	None	Under lower scroll	Over lower scroll
Mint	Melbourne	Melbourne	Sydney (?)
Mintge	5,817,000	«	«

Calcutta obverse

Designation	P20MS-2C-//	P20M-2C-//.	P20S-2C-/./	P20M-2C-.//	P20M-2C-.//.
Obverse	Calcutta	Calcutta	Calcutta	Calcutta	Calcutta
Reverse	Calcutta	Calcutta	Calcutta	Calcutta	Calcutta
Dots	None	Under lower scroll	Over lower scroll	Over upper scroll	"Double dot"
Mint	Melb/Syd	Melbourne	Sydney	Melbourne	Melbourne
Mintage	«	«	«	«	«

Fortunately, there doesn't seem to be any date variation to complicate this picture so the number of varieties is probably just eight, although there is the faint possibility that there may be even more undiscovered dot/die combinations.

To get some idea of the scarcity of the varieties, I present the results of two surveys. The first column represents a subset of my own collection comprising 26 coins pulled from a commercial hoard and 6 coins from a U.S. dealer's stock book. This subset is as close as I can get to an unbiased sample. I have several more specimens but they were all selected for variety and so they are excluded. Even so, my own sample is pitifully small.

The second column represents 170 coins surveyed by John Sharples who says that the sample is likely to be somewhat biased in favour of the rarer coins.

Two surveys

Variety	Saxton	Sharples
1C-//	1	0
1C-//.	1	8
1C-/./	0	0
2C-//	15	96
2C-//.	2	36
2C-/./	6	24
2C-.//	0	3
2C-.//.	1	3
2C-?	6
Total	32	170

Reverses

	P20S.2C Dot over lower scroll. All other varieties are similar to this one; the reverses differ only in the numberof dots and their location with respect to the upper and lower scrolls. Incidentally, this coin was afflicted with bronze disease and is an example of a coin which really did need to be cleaned.
	A close-up view of the dot over the lower scroll.

The following illustrations demonstrate that the "dot over upper scroll" variety is likely to be genuine. We start with a double-dot penny.

A double-dot 1920 penny

	Micrographs showing the upper and lower dots of a 1920 "double dot" penny in normal (halogen) light.
	The same dots on the same penny but this time photographed with through-the-lens illumination augmented by a lambda plate. In this configuration the microscope reveals the most minute contours on the coin.

1920 penny with dot above top scroll

	Region above and below the scrolls on a "dot above upper scroll" 1920 penny.
	The same portions of the same coin photographed with the microscope in contour-enhancing configuration. Note that there is not the slightest trace of a dot under the lower scroll.

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