Heres a link to it, but their images aren't that good http://www.coinsandcanada.com/coins-prices.php?coin=1-cent-1975&years=1-cent-1965-2012
Its there, maybe a little stronger too, lighting just covering the left side of the " 1 " I tried to catch the movement from left to right on the doubling of the " 9 "
It's important to remember here you're not looking at an American cent...the dies wear differently On the pics above, I see a thickening or shadow on the "19". A lot of these doubled dates are described as deterioration doubling. For a few I'm not as sure myself--because I would expect deterioration to affect all the digits. Here's another pic of the "doubled 19". Notice there's similar doubling on "CANADA"? Here's doubling on other dates--probably more die deterioration...
Thanks for showing up KurtS, I see a lot of what your talking about ( die deterioration, or die deterioration doubling ) on canadian cent, but this one isn't that, you can see the movement inside of the " 9 " and yes, its only on the 1 & 9, not the 7 & 5 .. I'll take some images of " Canada " This could be the real deal ( DDO )
Hmm...maybe. On the '75 I posted, notice how the "doubling" is on the base of CANADA, while on the left of the "19"? On a doubled die, I would expect to see doubling in a direction that's consistent for both areas. In other words, both the date and CANADA would be rotated around a common axis. OTOH, die deterioration wears towards the rim of the coin, which goes in different directions according to where the letter or date is on the coin. Just something I've noticed on Canada cents and nickels.