The 36rd Ed. of Krause Mishler declares that there are two types of these 10 Cents: KM 67 and KM 67a, while the only difference between them seems to be the fineness: Ag 800 (KM 67) to Ag 500 (KM 67a). At the moment we have only one of them in our catalogue here (https://en.numista.com/catalogue/pieces384.html).
Is there anybody here who has more informations? Is there a mistake in the Krause Mishler catalogue? Are there some marks to distinguish between these two types - if they exist?
Hi, a part of the answer is in your question : yes, they do both exist, but there's no way one can tell whether it's .800 or .500. Maybe you don't know, but 1967 is one of the very last years for circulating silver coins in Canada. The price rose far too up, and therefore the silver contents was reduced till nothing. 1968 is the last year of silver, and the only one with both silver and non-silver. So they reduced the silver contents during the production. If you look at the mintage year, there's a comment that says that both mintages are mixed up together since there's nothing that can tell them apart.
Regards,
Ginger
Si tu cognes ta tête contre une cruche et que ça sonne creux, ce n'est pas forcément la cruche... lollll mon proverbe préféré !
there are ways to tell them apart, its just not worth it. A jeweler has an acid and a machine that tests the percentage. Also if you could be very accurate this should work in ideal controlled lab equipment, https://en.numista.com/numisdoc/measure-a-coin-s-density-27.html
Taking a break from swapping for a while, but still interested in pre 1799 Spanish coins, I will make time for that!
Perhaps this is not a good solution for everyone, but I feel I was able to tell the difference between KM 67 (.800 Ag) and KM 67a (.500 Ag) using the 'ping test'.
I compared the tones of the various pieces, listening also to pings from other 10 cents Canadian types known to be .800 Ag mintages. I tried to strike them (drop them onto a hard surface) as gently as possible, of course. AFAIK, the pitch of the ping goes up in frequency as the Ag content decreases.
I hope this is somewhat helpful and that I am not mistaken in this method.
Verweis : "sestertius"Perhaps this is not a good solution for everyone, but I feel I was able to tell the difference between KM 67 (.800 Ag) and KM 67a (.500 Ag) using the 'ping test'.
I compared the tones of the various pieces, listening also to pings from other 10 cents Canadian types known to be .800 Ag mintages. I tried to strike them (drop them onto a hard surface) as gently as possible, of course. AFAIK, the pitch of the ping goes up in frequency as the Ag content decreases.
I hope this is somewhat helpful and that I am not mistaken in this method.
I agree with the "ping" test. Met with Robert Willey during a CNA convention in Toronto and he reminded me: "What the eye cannot see -- the ear can hear". Also, the recommended "hard surface" is marble or granite. Not much help I admit but I sort of fine-tuned my listening by using three different quarters:
1. a 1964 80%; 2. a 1968 50% (ANA certified); and 3. a 1968 pure nickel. Give it a go.
