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Further information here:

http://www.usmilitariaforum.com/forums/index.php?/topic/266275-another-m9-bayonet-to-collect/

For anyone that might be interested, my new book on US Knife Bayonets and Scabbards is out.

For further information and ordering, you may go to:

http://www.scott-duff.com/

The sheathes marked Camillus are 1990s reproductions. The key on the knife is the number of pins holding the pommel to the tang. World War 2 manufacture had two pins through the pommel - the 1990s...

Technically, it is impossible to tell commercial from military contract as these are required to be "off the shelf" items as are the M9MPBS bayonets. Rarely a unit may mark the bayonet with a number...

Oldguns.net has some: http://oldguns.net/catedw.htm

as does Gunderson: http://gundersonmilitaria.com/bayonet.html

Stewart has one: ...

I have seen the KM with number stamp before, have not yet found the explanation for it. Best guess is that it was added by some other country post WW2 when we gave these to countries all around the...

I have seen them on eBay from time to time. A dealer from France has the spring and scabbard catch with free shipping. I bought from him and was very satisfied.
...

As requested:

http://img.photobucket.com/albums/v97/bayonetman/MWOSmall_zps792a085e.jpg

I presume you mean the 1911 Colt .22 made by Walther and imported by Umarex. These come in 3 versions, the purely military copy, a match grade and the rail gun.

If so, I am not sure of what the...

The canvas scabbard is the Model 1910. Most were made by Rock Island and were marked R.I.A. and the date on the leather tip. If there is much wear to the tip, the markings may be obscured.

For...

I also don't like to split up pieces, and normally will not if there is a decent chance that they were originally a matched pair. However, in most cases selling them separately will result in a...

I also don't like to split up pieces, and normally will not if there is a decent chance that they were originally a matched pair. However, in most cases selling them separately will result in a...

sactroop is correct, and they are hard to tell apart unless you have studied them. The markings have slightly different fonts. The commercial reproductions had the sheath marked with the EGA and...

I agree. I still have my set from the 1960s reenactments and they are essentially identical to these. I think it is highly unlikely that they are older than 1960 or so.

Lacking photos, I think you may have the one below. If so, it is a commercial version made by a surplus dealer to put the USN Mark 1 training bayonet in. Not military issue, simply a cheap item...

Has the style of the A.C.Co. knuckle bow, but the marking is nowhere near right. Not like anything I have seen.

Top marking a known reproduction, bottom is original.
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To my knowledge, there is not a single source to answer your questions. Frank Trzaska did some fine articles on these in Knife World some years back and you may be able to get the back issues from...

Indeed, the USN Mark 1 scabbard was intended for use with the Mark 1 training bayonets, but I am sure that some got out even during the War, but post war when the training bayonets were discarded it...