Tim,
Nothing wrong with 'flights of fantasy'!
and with the unusual blade on this I can appreciate your inclination toward the somewhat distinct Dahomean blades found on the swords termed 'hwi'. It seems that one of these ceremonial weapons has similar crenallated blade back, but I cannot recall specifically and the reference is not at hand. It is shown in "Sabres Decores du Dahomey" (Palau Marti, 1967, but unfortunately cannot recall specific publication it appeared in, check bibliography in Spring for exact reference).
I recall the references to 'razors' in the book by Edgerton and some time ago was trying to determine more on this unusual weapons description as well. As you note the weapon in that book is listed as about 18", and I was also hoping for an illustration.
Burton (Book of the Sword, 1884) discusses these on p.168-69 from his observations in his trip to Dahomey in 1863, noting the warrior king Gezo, his love of varities of unusual weapons, and of course "...a company of Amazons, called razor women from the 'nyek ple nen toh' blade. This was simply a European razor on a large scale, with a steel of 30" rising from a plain handle of black wood, and kept open by a spring".
While the term 'nyek ple nen toh' is unclear in its exact meaning and is not defined in his copious footnotes, he does note that the reference to these weapons comes from his "Mission to Dahome" and is included with notes 'passim' along with other details. His comparison to a European razor of course held open by a spring with its huge size of 30" sounds questionable. His note sounds 'recollected' from notes some 19 years before, and I did not find evidence of such a collapsible weapon, but would look forward to hearing from anyone who knows of such a weapon in Africa. Since Gezo had such a fascination for unusual weapons and it sounds as if he was out to impress, it seems possible he may have created a number of such pieces in a ceremonial sense, but not necessarily for regular issue.
I am inclined to agree with Katana in his Asian assessment on this piece, as you have also surmised. The long handle reminds me of the dha form, which I defer more on to the Dha Guys! and clearly the incised marking at the blade center corresponds well to the other example knife you have shown.
I like the way you also present examples to show African similarities. Burton also notes the similarities in some weapons from India and Africa, suggesting that they may derive loosely from the same source weapons from Egypt, which of course is entirely plausible in a number of cases and in degree.
I would like to hear more on the Asian potential on this interesting weapon, and look forward to information from that field.
Thanks so much for sharing this piece......truly a great flight Tim!!!
All the best,
Jim