Is there serial numbers on these? If so where? Those chain rings started in the 60s and continued into the 80s from what I've found.
If there is a serial type number on the head tube starts with HC then a string of numbers its 70s or 80s and the 3 digits after HC will tell month & year.
Iirc on the left droupout most were a single digit then H followed my more digits and the first digit will be the last # of the year so 9h****** would be 69 more than likely
I have serious doubts about that HC prefix dating system that is floating around online. The reason I do is because of the head tube HC serial Huffy I have with HC3470706. It's highly likely a 1980's Huffy. It's a 3 speed light weight badged with stickers for Coast to Coast. The 3 speed hub is a Shimano 3S which is 80's and original tot he bike. They came after the Shimano 333 hubs. The only thing that would make sense on my serial is calling the 3 March and the next number 4 as 1984. But that is wild guessing on my part.
I've seen signs of 3 versions of the HC dating that seem to pan out or at least be very close.
My friend has his older brothers bike that was bought new in 1985 for Christmas and it has HC758***** so we figured it was July 1985.
I agree its a bit strange but can give a guess as to date.
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