just bought a bichaq at an auction with this description:
"Unusual 19th C., Asian Indonesian Malaysian Dagger Knife with Carved Horn Grip & Silver Mounts. Total Length (inside scabbard if present) : 10 1/2" Blade Length : 5 1/4"
Obviously it is a Bosnian Bichaq, a non K.u.K / non Habsburgian one but dated prior the occupation by Habsburg Austria , so before 1878.
My guess would be around 1850 /60 based upon exhibition pieces in Sarajevo I saw.
Now I shall have to wait until it arrives and clean it