Help with identification

Hi fellow collectors. I need assistance to identify the attached cartridge. I think it is a .5 in Vickers but cannot find any reference to the headstamp. The dimensions are: Case Length = 80.1mm, Rim Dia = 18.2 mm, Bullet Dia = 12.9mm. Thanks

.50 vickers
K42= kings norton 1942
FIZ= semi armor percing mark I loaded with nitrocellulose

Thank you very much Laurent, much appreciated

K should be Kynoch not Kings Norton, as in 1942 K.N. was long out of business.

Thank you pete for correcting my mistake, as you said K is for kynoch as kings norton was out of business since 1919

Info here for you