ID 50 Cal Headstamp Please

[jayteepee_1999]

Hi All, long time since my lasty post - I am looking at ID for the 50 Cal headstamped cases that are now made as tranch art - i made these in the Falklands in 1984 and found them whilst clearing out. I did have 6 but seem to have mislayed one. Any help would be great as I am thinking of selling them but need to know a little more history around them? Thanks in advance
JP

 

[glevum]

All UK made cases by Kynoch in 1955

1Z is API

6Z is Tracer

from

The Reference Book On.50 Cal BMG (12.7 x 99 MM) CARTRIDGES by Ron Fuchs