Nice looking wing but would be too expensive with the customs charge unfortunately.

Thank you all for your kind words.

The holes are actually watering holes to drain water from a folded down windshield. When the windshield is folded flat, the 'box' beneath the glass gathers water so two holes were added shortly after the beginning of production to allow the water to drain from the windshield. Holes are placed in the very corner of the tubular construction so that driving in rain with windshield up doesn't allow water to enter through the holes and only a very small portion of the hole is visible from the inside, just enough for water to exit... These holes were absent from post-WW2 French made windshields and until recently were not included in reproduction panels or complete repro windshields... Current production parts do have them as shown on second photo below...    

There's a book by chris aleck called "AUTHORIZED SHOULDER SLEEVE INSIGNIA OF THE U.S. ARMY" it has every TIOH approved insignia. Problem is the military wore a massive amount of unofficial patches. It either started or got popular during WW1.  Vietnam is the peak of unofficial patches being worn. It can be variants of an approved unit patch, unique pocket patches all sorts of crazy stuff.   If you were referring to present day patches, looking up the unit name helps. Usually when a new unit patch drops theres some sort of article or official mention.  

Please post a photo of one of these repros for comparison. Because as far as I see, it looks like the supposed originals posted in this thread. 

It seems the mystery has been solved by members over on the great war forum. The scabbard had the leather replaced by the "S.E.Norris & Co. (S.E.N.) and inspected in 1940. The "W" means wax was applied (beginning in 1923). Thanks for he help.  

OH SWEEET!!! NIce looking pin and fuze body... wow it looks just like the one I have, maybe there is hope it's real pin. I can tell you sadly the metal fuze detonator had to be cut out and removed... I have it but it's destroyed,  it needed to be compliant to legal rules and that had to be destroyed to inert it. It was a live fuze with the spoon and pin. There is trace of powder residue. It had been completely destroyed inerted,  that's why I wish the paint was a little better on it. I'm guessing process to inert caused it but again it had to be done. All of my stuff is legal, the one you show had been fired off. Why or how he got it off the production line to do this my guess is that fuze spoon was badly bent when I got it, so I'm told it was rejected at the factory after it was live then was inerted. I looked with microscope and you can see some residue stain. I asked and back then or maybe even now I do not think its legal to have a fuze with a intact detonator even if it's empty. It must be removed or fired off like yours is. All it was a metal extended out part of a inner soft metal lining. I believe when the grenade fuze ignites that melts and seals the fuze with the blast to make it more efficient? Idk... its pretty soft metal. I can post it sometime, that destroyed inner lining part is still in storage but if it helps give providence I'll mame sure to keep it around.

More detailed pics of key elements would provide help to provide a better assessment.

Isn't it strange that this style M1916 holster doesn't show up very much but there are way more commercial copies of the M1916 holsters using the post and hole design?

Just bought this one today. Haven't been able to find this variant.  Neat Japanese made still with the sticker!