I wonder what these were meant to be used for ?
An interesting history maybe ...
https://www.ebay.co.uk/itm/TWO-WIND-UP- ... rk:14:pf:0
'Motors' - HIGHLY UNUSUAL, SEMI-MINIATURE DESIGNS
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Re: 'Motors' - HIGHLY UNUSUAL, SEMI-MINIATURE DESIGNS
Most likely these would have been used in portables, where a small, lightweight motor would be an advantage, permitting more room in the case for the horn.
Bill
Bill