Well there is that of course. Personally I have never studied a civy one to dictate a list of differences. But if I had some pictures of a suspect bike I could compare them with what I know to be correct for a military ML. They do have different centre stands and a military bike should have folding foot pegs.
Scrutinizing the numbers would be a start though.
For 600 euros it would be worth buying if it was a military or civvy one, the cheapest one you'd see in the Uk on eBay would be around 1200 to 1800 GBP and that's for a civvy one, double that for a military one, the frame number will tell you more, the number is stamped at the bottom of the headstock and is very faintly stamped..
Dave I agree that the headstock stampings are very light, I have a very civi looking ML (still in maroon paint) with the wartime no, over stamped with xxxxx and a new post war no, the stands are different, plus other tell tales, that we shouldn't go into on here,A second frame I have has a wartime no only, I believe that James ML bikes like the RE flea were sent back or bought back by the factory for turning back into civi machines. Prices depends on condition but 600 euros seem a good price for a post war one Andrew.h.
So now, I am also the proud owner of a James ML.
it is in good condition, has been injected into oil for the last 40-50 years.
Almost complete, except the center stand and unfortunately all the miliary parts, such as, tool box, foot rests, handelbar-quick release, and front and rear lights ..
so if anyone has these parts for sale, I am the buyer for them.
You should use a Villiers 'Hammer-tight Spanner' to remove the flywheel, but failing that a good stout ring spanner will do. The centre nut is captive within the brass flywheel, so hold the flywheel still and give the ring spanner a couple of smart whacks with a hammer. Once the nut starts to move, keep undoing it and as you do the flange on the nut will draw the flywheel off and it will become loser and loser until it can be taken off. The nut should be turned in an anti-clockwise direction and after a couple of turns will start to feel like it is tightening up again, but keep going and it will come off eventually.