A newbie to this forum I hope you can stand newbie questions...
Would an older M2/M3 ever ready case fit to a M6 camera body? The body dimensions should be the same but perhaps the thread on the screw mount is a different size?
Older M2/3 cases in Europe do have mostly a thick ('German') screw, and do not fit the M6. However, in the US, on ebay, you can find many M2/3 cases with 1/4 screw thread ('English'). They fit very well and when you find one in a good shape (about $50) you have a beautiful thing. Their drawback is that the snout is fixed and can only be removed by using violence (saw). Using only the part in which the camera is fixed by the screw keeps your body clean (no wear on the strap carrying eyelets: the strap is connected to the case). The cases which have a provision for carrying the camera with lenses with 'goggles' (35mm and 50mm DR) are the best, they offer extra protection at the right side of the camera where its most fragile part is located: the viewfinder.
On sigurd's query re an m2/m3 case for an M6,as a temporary solution until you get a better case, you can remove the European screw from the case you have by carefully lifting the red felt inside the case, sliding the lock nut aside and removing the screw completely.
You then find a screw that fits the M6 -- preferably a Leica screw from a damaged Leica case-- and simply replace the new screw for the old one.
I've done it a few times and it works very well if you use an original Leica screw because they are larger in diameter than common replacement screws. -- bob cole
That's one of Luigi's cases and I think you'd find it to be outstanding as far as quality and fit goes. They're not inexpensive but nothing in the way of Italian leatherwork ever is. They're amongst the best in the world and are reknown for their leather mastery.
As far as a half case goes...they're called "never-ready" cases but I must admit that they save your camera from being banged up. I will usually have a half case on one body when I'm carrying more than just a single camera with me.
You'll NOT have a disappointment with the above case though.
Actually, the half case is an EVER ready case. The only thing you can't do with the 1/2 is change film.
The full leather case with front is often called the never-ready. I always keep my M6 in the Leitz half case and it fits my hands beautifully and at the same time offers protection for much (but not all) of the body.