Soft vinyl with a coin slot in the back, the head is adjustable and will come off when pulled. They are quire rare in the UK but easier to find in the US. This one is from 1973.
@The Moog Wow. That’s in damn fine shape for ‘73! Big Boy always stood out to me as a kid, as far as mascots go. Only ones that struck bigger chords with me were Count Chocula and Captain Crunch. Something about his classic attire, hair like the tip top of an ice cream cone, and that cherub smile.