I cannot remember a topic with “holy grail” in the title that didn’t end in some variation of this.  

Not what I was referring to, but now that you mention it... 🤭    

RKurz,   Welcome to the forum....    Considering that a very large majority of members here served in the Armed Forces of the United States of America, and many in the United States Air Force during the period that this very common shirt was worn,,, Don't you think that we know as former Military Service members of said Armed forces know what we are talking about?  We are not dishonoring you by making the informed comments about the true nomenclature of the shirt....   You may have done your research, but I will back Kurt A 100% that this is a common USAF private purchase shirt for Officers, not just pilots, but many others...   Sorry that you don't like the feedback you are getting but keep in mind the last sentence of your rather lengthy post:  I quote:   "Maybe I am wrong, but I have spent the entire week studying these facts... and the technical evidence is overwhelming. Thank you for your time and expertise."    You seek opinions and our expertise,,, and it has been given... This is a $15.00 US Air Force shirt... Nothing more,,, nothing less...   Best regards   Leigh 

Sir, I'm new here, just because I found something that even you, with all due respect, don't know, I would never have created this prestigious forum to copy things from AI for you, yes, I have the specification and everything fine-tuned from AI, but the original of this piece is next to it... and if you want proof, I have no problem filming you all the insignia and the shirt as you wish... and I'm sorry that someone can say this, to someone, when you know how much we value the liberation of your Army of Pilsen....  

The back of the two Chief Engineer collar pins are quite similar so I am only showing the one that matches the hat badge.  The collar pins have different propeller designs.

Hello everyone, please, I don't need anyone to dishonor me after my first login, if I got this artifact, I'm writing, it's a fact and that I worked on it all week, that's also true, if someone doesn't even know what I actually have, I'm sorry, I wrote to this forum to find out more, I'll send the shirt as a gift to Wright Paterson, I have no problem with that... and I apologize for my English, but the facts are given and he has the shirt with him... nothing more, nothing less

"Sir, I am not a scientist. I am just someone who found this artifact during the Liberation Festival in Pilsen. And if my English bothers you—yes, I have to use a translator because I am no longer as fluent as I used to be. But I know for certain what I have found and what I have discovered after a week of research and consultations. I stand behind my findings."

I’m not sure how you reached your conclusions (AI gone wild?), but the shirt pictured is a very common USAF private purchase officer’s shirt with little or no collector value.  

The blade profile of the M1905/06 Experimental is very close to that of the M1902, so some M1902 scabbards do fit.  I don't think the M1905/06 was in service long enough for this to have happened officially, though, and I'm unaware of any period photos showing this being done.   The scabbards are notoriously fragile and many sabers were likely sold off either without scabbards or with the scabbards in poor condition.  Personal opinion, the M1905/06 sabers we have today with M1902 scabbards were mated together after the sabers saw active service.