First, it is not a cake knife.
It is a serious weapon.
I have seen this yataghan and I was also thinking the late date. In a lot of villages around Greece it was a tradition to wear knifes in the belt till 50s or in some remote areas even later. I have my grandfather’s last bitchaq and as I told it was the smaller one of the pieces he used to wear. So as we go back in time knifes were bigger and more fancy.
Also in 1907 Greece was half of today’s size. The north part and lot of islands were under Ottoman rule. So there were a lot of rebels (or freedom fighters from our point of view). These rebels did used swords as a backup weapon. Their rifles had usually one shot. Actually we have proofs that even Greek partisans in WWII used swords in battle!
I believe that the piece is fully authentic and it was belonging to a Greek sailor, maybe involved with rebels. The man was in desperate love so he asked someone to write the two poems on the blade and he added the date. The sword was possibly already old fashion.
The poems are very interesting. They use old types of grammar and they have spelling mistakes, showing low education. But as meanings they carry a tragedy that now days sound like soap opera.