Revolver case with headstamp GR (logo) Winchester


I identify this case as .450 Revolver Short CF made by Georg Roth. But I have no idea what headstamp “Winchester” means. May be case or cartridge was made by GR for Winchester?

Thanks for any info regarding this headstamp


Hello treshkin, this was a .44 Winchester Center Fire (.44-40).


Thank you, Fede!


Has someone perhaps modified this case to make ammunition so they could shoot another calibre?