Maybe a breakthrough on this but have yet to find confirmation.
This reply from the lock forum may help :idea:
QUOTE....
I suggest this is a spare wheel lock, French (or possibly German?), first half of 20C up to c. early 1930's.
Try it on a vintage/veteran car forum.
The roads were still littered with horseshoe nails, motor car tyres were narrow, tubed not tubeless, and on wire wheels. Little possibility of a 'slow puncture' - instead, an immediate need for a spare wheel. Most cars carried one, many posh touring cars carried more. On the front wheel arch/running board, or on the back, they were easily removed by another motorist in need. To stop this, a wheel lock locked around the tyre, making it unusable.
A more common US version has the end around the tire tread formed to a point, to give an even more bumpy ride(!) and leave an easily followed trail of damaged road surface, leading to the thief's car.
This sounds plausible
Andy