1" signal ? cartridge ID

[reccetrooper]

This case is 1" x 5 1/4"
The head-stamp appears to include the letters i r v and date digits 88
Single black band around the case, and red primer annulus.

Does anyone know what it is and the maker?

 

[Bellifortis]

Hallo,
I suspect that it was manufactured in the CSSR.
Merry Christmas,
Bellifortis.

 

[rigby]

Yes this a czech manufacturer.
irv - Zeveta Bojkovice

 

[reccetrooper]

Thank you for identifying the country and maker. I have sent an email to the current company, Zeveta Ammunition, to ask what type is was.

 

[Tmine35]

I have similar ones, they are flash and bang.