Here is one I wrote about in 2003 for Brian Raines on an 1858 20c piece. A different variety on a different denomination yet so similar.
Here is what I wrote:
"July 18, 2003 -- Brian Raines of California reports finding a Province Of Canada 1858 20 cent piece with a wildly triple punched "I" of GRATIA. The more prominent underlying "I" was punched into the die way too far north with its top positioned slightly in the denticles that border the rim. Evidence of yet another underlying "I" can be seen best between the other two "Is" as an upper left serif of the top of an "I" to the west. Other letters of the obverse legend also show minor to moderate repunching with another notable area of doubling being the "I" of DEI.
The obverse of this sterling silver, one-year-of-type coin, features a young head of Victoria designed by Leonard C. Wyon. According to the Charlton Standard Catalog of Canadian Coins, "This unusual denomination was chosen as a bridge between the two systems. It apparently deferred to the pounds, shillings, pence basis of the Halifax currency system while naming the new issue in the dollar, cents, mils system. The relationship between the two systems meant 20 cents was equivalent to a shilling in Halifax currency, and it was assumed that consequently the new coin would be found useful. This assumption proved unfounded because there had been no coins representing a shilling in the old system; the British shilling coin was worth just over 20 percent more than a shilling in the Halifax system. Furthermore, the size and weight of the 20-cent piece led to confusion with both British shillings and U.S. 25-cent pieces."
As one would suspect, the coin was eventually phased out of use with most of them sent back to
The Royal Mint in London for re-coining as 25-cent pieces after Confederation.
The variety has been listed by CONECA's world variety coin attributer, Ken Potter, as VCR#1/RPL#1. Raines submitted the coin in September 2001."
Today, I'm less sure of the third "secondary I". It seems to me it might just be verdigris.

