David,
If you would like to give that helmet a good permanent home, please
consider donating/loaning it to the TSS "Museum". We have a display
of historical items that have been donated by numerous old-time
cavers. It includes helmets, carbide lamps, ropes and vertical
If you mail him a letter, please feel free to include this one below:
Dear Bob,
At TCR in 1986, you donated a very rare Headmaster caving helmet as a door
prize, and it was the top door prize that year.
My name was drawn, to much hisses and sneers and laughter for winning that
awesome helmet.