Hammerli Single info

[Geezer]

I defer to Mark’s expertise, but John Walter’s book says that they were introduced in 1961, and stopped being made in 1977 when the production line had a bad fire. Though new old stock stayed in the catalogue for 1978. Walter suggests the later ones benefited from internal improvements primarily made for the more expensive Master, in particular a feature where once the CO2 had dropped below a certain level, it would be automatically vented to the atmosphere, as a very obvious way of telling you to change the bulb.