I'm sorry, I just have to comment on your stated observation. Please don't take it the wrong way. Saying to @johnmilton, "You have some very nice coins.", is like saying the Museum of Natural History in NYC has a nice collection of dinosaur fossils. John Milton is our very own resident Smithsonian Museum. His collection is the creme de la creme. When I see John Milton post coins I need to first get my mop handy, so I can clean up my drool. So yes, I agree, John Milton has 'some very nice coins'.
I completely understand what you mean. The statement I made does not do his collection justice. My humblest apologies.
between Johnmilton, Robec and a few others, there are some very very fine collections around but I had to toss Robec in there as he's responsible for at least 1/2 my drooling
Nothing to drool over but here are some semi-keys. Barber added an extra fold to the right ribbon end in 1901 so the second 1901-S below is tougher to find than the first. For 1902-S the majority of coins are the "correct" thick ribbon reverse, but then for 1903-S oddly they flipped back to coining a large majority of the old thin ribbon reverse, and the "correct" reverse is scarce. For world coins, the key Canadian dollar is the 1948. What's difficult to understand is that the 1947 Maple Leaf has the second smallest mintage but doesn't get the same attention or value. It was also minted in 1948 but for some reason Canadian collectors treat it as a variety of 1947. (They were waiting for dies without the ET IND IMP since the king was no longer emperor of India but demand forced then to use 1947 dies with the maple leaf added to signify that they weren't 1947 coins).