[size=12]I'd also say that the 777 is a lot more common of a pan than the 768 is. They were making 777 chicken pans into the small logo years; they can be found with small logos and each of the three handle variants that the other small logo skillets are found with. I don't know for certain that all of the 777 smooth large block logo pans also said "OR CHICKEN PAN" beneath the words "CAST IRON SKILLET," but I think all of the ones that I've seen have said that. The larger sizes of large block logo pan weren't self-identifying as chicken pans, but the 777 did.
Personally, I don't think I've ever seen a 768, except in photographs.[/size]