Salaams Ibrahiim,
I too cannot find a definative reference to scissor daggers being a genuine weapon. I do find that references refer mainly to Ottoman or Persian examples. Both civilisations were subject to subtifugue and assasination...perhaps there are a few genuine examples used by an assassin or perhaps as personel protection
There are so called reproductions of 14th Century European scissor daggers but cannot find an original version
Kind Regards David