Cobalt 60 has a half life of 5.27 years.
If the 7-1-63 is a date stamp of original manufacture, it’s gone through over 11 half-lives. There’s less than .05% of the original flavour.
I don’t know about the decay products, but I’d wonder how far we are from legitimately edible.
Is it pronounced like the blood thinner/rat poison (warfarin)?