Canada: KM# 59.1 & 59.2

Hello!

I'd need some clarification on these coins 

N#432

From 1965 to 1977 ➡️composition: 98% copper, 0.5% tin, 1.5% zinc; thickness: 1.65 mm. Right?

In 1978, 98% copper, 1.75% tin, 0.25% zinc, 1.52 mm. Right? 

Then, we have the 1979 piece in here. This one has the same composition and thickness as the 1978 coin, so the difference would be the modified portrait. Right?

N#444580

And lastly, the differences between KM# 59.1 & 59.2 are the composition and thickness previously mentioned, right? If so, are (or shouldn't be) all the 1978 coins KM#59.2?

See this discussion I replied to today for some background information.  https://en.numista.com/forum/topic149839.html

And yes, all the 1978 year lines should have had the KM# 59.2 added to them. Some were either overlooked or added later without the reference number.  I just submitted a CR to add it.

rsirian1

 

And yes, all the 1978 year lines should have had the KM# 59.2 added to them.

I don't know. It depends what's the difference is between the KM# 59.1 and 59.2

Is it the thin planchet or the modified effigy like they've said earlier?

Is it logical 1978 and 1979 are both KM# 59.2 while the 1978 has a large head (identical to KM# 59.1) and the 1979 has a small head. I don't think so. I think Krause mixed up.

I was speaking from a technical perspective where you can't assign a KM number that doesn't exist for that coin.  It is KM# 59.2. If it should be is a different question I think best handled by the Comments section.  Currently Numista has the 1978 listed as KM# 59.2 and the three variants as KM# 59.1, hence the question by the OP. Are the 1978 and 1979 really thinner planchets? I don't think we know that for sure. Measuremnts on the edge of minted coins won't really help as the edge could still be the same.  Maybe the best thing to do is to keep the direct connection to SCWC by keeping the KM numbers and explaining the real difference in the portrait. That's where Ole's graphic would help and why I asked the question.

In the meantime, it seems all the 1978 coins have just been assigned to KM#59.2. So we can assume that these 2 subtypes are only related to the composition and thickness differences. But there should be something in the comments to clarify that the 1978 differences make this coin year the second KM subtype.

At the same time, the 1979 piece keeps its independent page because of the modified (reduced) portrait, and it seems fine to me.

Anyway, I'd like to hear something about this matter from some Canadians and their local catalogues (no referee for Canada?!).

@Sjoelund If you agree, could you make a CR after adapting your graphic? https://en.numista.com/forum/topic149839.html#p1182932

(Btw, I'm just registering my Canadian coins, and Canada catalogue is quite “weird”. There are even lines for loads of die chips!)