Quality random check control?maybe............
Maybe...Thanks for your answer Mate!
Maybe a manufactor's stamp...
Its the manufacturers stamp, I've got a pile of them written down somewhere. Next time I'm home I'll try to locate them and let you know what it stands for, or I'll see if I can get in touch with the guy that told me what they were. Sorry that I can't be of more help right now, but I'll see what I can do.