see the second and third, they have identical cartouches
the blades are completely new, as the handles and crosses... everything is new. they are acid aged just as the subject kilij. As per Ariel's earlier comment, I'll not give up more hints to those who make them.
The last one also shows some age, but is it any old? see the below image that Harry recently posted for sale (Harry, hope you do not mind I am referencing your item here). They are similar, but one is aged, no? i mean it can be a few years old, could be 5 or 10, but 1800...?