Guarantee certificates have always been an object of fun.

They usually turn up on the back of some worthless rug from Pakistan ,Turkey or the Gulf full of excruciating technical jargon to blind the gullible boasting of such gems as Princess Bokhara.
As the saying goes " Not worth the paper they are written on " In this particular case judging from the 20th cent rank badge this label was attached to it seems the paper certificate is probably more valuable than the object itself.