Without a doubt, this particular guitar was one of the early ones.
As to whether or not it is THE earliest, ..................... remains undetermined - if not impossible to ascertain positively (all that were there who could ID it, are no longer with us & there are many problems that arise / questions remaining unanswered upon deeper inquiry).
JMO, but spectacular claims require spectacular evidence. Otherwise, I think skepticism is always warranted (regarding claims that it is THE FIRST one).
- Capt. "EL."
PS - Veronik, ........ I will leave this post / thread in the ELVIS Section, simply because I think - given the nature of it & its implications ----> it is better served here vs. in the "Articles" section - in this case.