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Lathes.co.uk lists the thread as 0.199" by 0.7mm pitch.

The closest tap that I have managed to find is M5.2 x 0.7mm. I have just made myself a new drawbar for my 6mm Lorch Triumph using it and it works fine.

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I wonder if Lorch used the Schaublin B6 as its base? The B6 5mm x 0.706.  looks pretty close. A lot of the smaller collets have weird thread pitches in metric, the B6 0.706mm pitch is exactly 36 threads per inch; I think some of these came out of the American watch tool industry.

 

It looks like the tap and die maker DC Swiss offers a tap for this thread, W5 is the reference.

 

schaublin collet sizes.jpg

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