You can still get 'em Nerys,
'Putt Putt' or 'Pop Pop' Boats. Lowest possible Entry Level!?😉
Ten years or so ago there was a resurrection of them here, made of recycled Coke, Fanta, Beer cans etc. They call them Knatterboot here.
Still got one in the cellar, somewhere 🙄 !
Cheers Happy Pop-Putting😎