5.56mm blank

good morning to all,
picked this 5.56mm blank up the other day, green plastic body,brass head/base,no headstamp and with a black annulus.
Vendor said it was Swiss,and it does have similarities with the Swiss 7.5mm Blinde Patrone 58, but my ‘gut feeling’ is that this cartridge is Spanish??

Can anyone comfirm either or even something all together different?

All the best

P9070001 P9070002

As per “Fuchs” Swiss, circa 1981, Produced at Thun, stk# 594-0343

Thank you very much Frank.