1970 PL Nickel Dollar Doubling, Possible New DDO, Notched A

So, how is the verdict? Does it look like a doubled die or a doubled hub? Or something just happened to the A and I am seeing things?

I am unconvinced that this is a doubled die. The A in REGINA looks like the die or master punch was damaged. The doubling is seen all around the legend, at the top of each letter, which suggests to me of Die Deterioration Doubling. The best letters to look at, for possible die doubling would be the I and Z in ELIZABETH. Perhaps you should solicit the help of those in the US Modern Variety section on CCF to comment, those folks (e.g., Coop) are way more experienced in seeing small die doubling than I am.

I am pretty sure the R in REGINA, at the bottom of the character, is a die chip.

I didn't look at the ELIZABETH, actually. I don't remember anymore what I saw on that coin but looking at it head-on looks very different than looking at it tilted it a bit (and the tilting bit is just to reduce glare when photographing).

I'll put up a thread there then to get their attention.

The mark on the "A" might be a hub issue. If a lot of those coins have this, it maybe the problem. I'm not familiar with the Canadian coins. Beautiful coinage. Just don't see it on a regular basis. I've seen a lot of Die Deterioration and Machine Doubling on this thread so far. But when I think doubled dies, I look for the devices to be enlarged. Not just with notching like on the "A" on this thread. So if you have more examples to made a side by side comparision, that would help a lot to see if the devices are enlarged/showing spread. Hope this helps.

Thats what it appears to be alright. Here's the A&R from mine

I found the same "double a" on my 70 dollar coin & it seems the "I" is identicle.

I also noticed this coin is double stamped as it's frosted & the second punch is obvious in the pics below...

Very curious why it looks like numerous layers on some of the edges....I will take full pics when I get a chance.

I've lurked on this thread with interest; it reminds me of one I started on George VI 50 cents (which didn't generate much response).
https://goccf.com/t/194753

aardspeed, I see similar "layering" on the left side of N and D in CANADA on the late 1940s 50 cents reverse. I don't have the capability to get a good photo (yours are amazing), but with a magnifying glass and the right light angle it seems tripled to me. The points on the A's also seem like a separate layer at the surface of the coin, and the way the N gets thinner at the bottom seems like the bottom "layer" was polished off the die. I stopped thinking it was any real variety and decided it was just the way they made the dies. Here's what I'm talking about from the other thread, as far as where I see it.

Sorry I can't do any better. This is from a 1945 50 cent. Multiple of my 50 cent coins 1941-1949 show this "layering" on the left side of the N. Don't mean to hijack the thread, just thought it seemed similar to the various pictures of this effect from these later dollars, and thought it interesting that a similar effect is on a different series from a different era.

I drew red lines to highlight. It's pretty obvious under magnification but the only way I can show it is to take the clearest picture possible and then zoom in, so it gets too mushy. Perhaps somebody also sees this on the 50 cent and has better equipment, but probably it's not that important.