(Again, ok Im a blacksmith, ok algerian and self proclamed specialist (lol), but I still can absolutely wrong on what is coming, so only my theories... )
Well Yuri, for me, yours is clearly a weapon.
But first STRAIGHT Flissa daggers, with my "smith" eye, are all, weapons, in the willing and style of made, even those made for deco, let me explain....
Those are effective tools, "SOLID", and respecting the exact same way of making than any knife, and in this case, even for a long flissa. For me, the principal point, is the bolster. Nobody want to forge a such thing, going from a thick piece of steal, heating it, lenghten it, inlay it, etc... just for deco. There is absolutely no reason for to add yourself such a work, but the solidity of the object. And you gonna tell "ok, but all straight daggers have that bolster"... And I will say yes, so those are weapons ..
BUT, we all know here that lot of them where sold for tourists, so how really make a difference ? We can not... in my tought, even the Kabyle jewelers from Ath Yeni tribe, copied that style as the "right way of making".. Even when some "curved" model without bolster was also made, just by cutting a steel sheat. So know, how it was in those shops ? May be just the price was different, and may what was initially a weapon, became something deco, and losts most of ist initial caracteristics, as for many cultural things in north africa, or anywhere (ex. moukahla, horses sadles, stirrups, etc).
Now yours. So if we cant really know if a model is a weapon, or not, we just have to look it, a make a choice. I mean, the steal is the same (usually), the deco too, so it probably only depend on the smith skills, the sharpness (even if, those are not made to slash, but to thrust, kabyle like "rasors" for slashing, as known by the saddly name "kabyle smile") etc. And what I see on your is a particularly well made one, the tip looks very agressive, really made by some who was thinking to its use. The deco are also for me a good info. contrary to what some people think, for me, as more as the inlays are qualitative, as more as the "weapon" is good, and not a deco. For ex, all those fake curved daggers without bolster, display the same, like just one line inlayed, and few engravings, and not deep.
Now the handles...
ALGERIANS, NOT DUTCH
Not the same hands
I mean, of course there was a lot of "big" algerians, but as everybody know, we, human, was a bit smaller the past centuries. If you add to that the general tall of mediterannean people, AND, a probable heritage for that mersurement, that came for earlier that period, 10cm (yeah, personnaly count 10cm, from the bolster, to the end of pommel), is a quite good/sufficient leght.
10CM is actually a standard in algerian weapons, that I found a lot, even for longer swords, a lot of flissa, nimcha, etc. Sometime only the pommel is a bit bigger, but same surface for the hand.
Here is a picture of the handle of one of my daggers, comparing to two yatagan, and one sudanese kaskara. See that the difference is imperceptible.
Then, this is a thrusting dagger, so even the pommel is "useless" and can be hold by the two last fingers, despite blocking the hand as for a nimcha.
The two second pictures are from what I call "flissa dagger" (well, in french I call those symetric models "dagues", and the straight ones "poignard"/knife flissa... it help me making differences). For me, those ones are mostly decorative.. but not all (as for curved ones). I presume that those models are probably herited from real used weapons, and became to begin trash with time (ps.. note the similarities with some serbian daggers from sarajevo in the 19th). As for others flissa daggers, I judge by the "weapon" quality, by its making. I think, that probaly both could be sold by the same guy, as just two different quality of knives, even if one is clearly a toy...
Notice that big bolster, when the other is just "cut" in a steel plate, have a little nail as tang, etc..
Then, is just a simple flissa knife of mine probably french era. Just interessant because of its conception, purely usefull (dont judge by its shiny look, it had been restored, but its quite old). Look at this "file" steel blade, that keeps its marks, and the very simple handle. No decoration at all, because just of the hardness of this steel comparing to local ones, or just the guy dont know how.
PS... this one is still very, very sharp !
However, this model is interessant because it seems that such knives was really use by locals. What happen to all of those is still a mistery, that colonistation alone cant explain (... Oh, have I talk about our "civil war" against terrorisme in the 90"s, when having just a screwdiver could take you to jail ?? Every knifes banned, their making, their selling, and of course their collecting ?? Every weapons taken, no more huners for a decade, in whole algeria, etc etc... another black point of our history, on weapons craftsmanship... even the skills of bousaada, its a miracle that its still some smiths today, herited from the ancient, and just due to their distance from the north, and its various conflicts)
And finally a model sold on auctions, that Ive seen many from that shape, usually like the previous one, with very few deco, obvioulsy for use, and clearly ottoman era (handle shape).
Hope it will help understand a bit more the complexity on establishing if an algerian model is a weapon, or not