@ marthandan: Thanks buddy. Really do not have the specifications for the steel. These were made years back but I know that most of it is a variety of a kind of "tool" grade steel. One of these also originates from leaf springs.
Yes, that is damascus too.Edge retention is not among the best that I have seen. At the best it may be called average. Not really good for cutting tough material.
@ slingshot: Thanks! Yes the "trench" knife is an interesting one.

The spikes are removable and may be unscrewed and stored in the sheath. The sheath has tiny sections for the spikes.
You are close to the origins of a couple of the blades. The rest was made in India. Some mix and match stuff has also been done to the designs and the leather sheaths were made in India.
@ Moin: Seems like you missed the first ZT and the Fallkniven F1
What else is in there? Just a few more blades
The double edge daggers are good and not too large. The handle too offers a nice grip.
The last two blades are not faux damascus. The metal is a type of factory produced Damascus.
Of course you have handmade characteristics but actually the grind on the serrated back blades is not really less than perfect. The grinding wheel marks have been intentionally retained on the one with the brass spacers in the handles (and the sharpened clip point) as a sort of a unique finish. The finer wheels were not used on it nor was it buffed / polished. Therefore what you see is not really an imperfection.
The larger Bowie style blade which appears more Rambo like

had a nice shiny mirror finish on it when it was new but now you see dried oil and some rust on it.
The handle material is Buffalo horn, wood and in some cases a synthetic acrylic like material.