1960's FDC's

Not really in my collecting interests and no catalog to help. Checked on ebay but no matches. I'm assuming they're common as dirt ?

Unitrade puts $12.00 for #411. #492 is at $6.00 for a single, but doesn't list a value for a block. It's probably a bit higher. I don't see any of the plate varieties on the stamp. Art Craft cachets of course are common as mud, but probably still better then the later Canada Post cachets.

There are examples of these stamps as FDCs on ebay, but I didn't see any with the Art Craft cachets (Rose Craft is comparable). I'm sold them before in the past and usually they fetch $1 to $5 each.

I don't know if it's comparable, but if you can apply the US formula to first day cover values, blocks of FDCs typically sell for 1.5 times more than a single stamp; plate blocks (inscription blocks) 4.0 times more than a single stamp.