It is branded F. Lorch on the head and Germany on the shaft. It is 8mm diameter but at about 51.3mm long it is 16mm longer than standard 8mm collets. And there is that left hand thread. Lorch made lots of 8mm WW style collets but I am not familiar with these.
It is pictured above an 8mm Moseley Long collet & a standard German made Boley WW 8mm collet
It is pictured above an 8mm Moseley Long collet & a standard German made Boley WW 8mm collet
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