.450 Unknown Blank. (Edit: .450 Revolver Blank for Michelin tyre pressure alarm)

I have included two photographs of the headstamp to try to show that this appears to not be a CF.

Could this be for launching something, or line throwing?

There is a big plug of what appears to be shellac, sealing the cartridge.
There are also spots of ‘shellac’ sticking to the sides and the base.

Any help in identification (use, origin, date) would be greatly appreciated.

Hi Sam,

It’s a blank for the Michelin puncture alarm device.



Hi Fede,
Following your lead, I found a previous discussion on IAA (.450 Rev. blank for Michelin tyre pressure alarm):

What a surprise!

Many thanks,