We’re calling these wee ice screws ‘vintage’ as they are, though we would normally have a maker’s name attached, unfortunately we can’t find one. This often means that they are homemade, but the fact that we have two, and the same same type is noted in the Encyclopaedic Dictionary entry above (8) would seem to indicate they were commercially produced, please let us know if you have more info.
Either way, these are screws on the evolutionary scale and along with 9 & 10 above were the first screws to appear in the 1960s, prior to that ice pitons were hammered into the ice only to be hacked out some time later, ice screws were much easier to place and remove and modern screws have made it easier still.
We’re not quite sure where these guys came from, we have a box full of old screws and these guys were lurking at the bottom.