It's is a nice even cut trying to find out what kind of saw.

It's is a nice even cut trying to find out what kind of saw.

You'd want a hand held jig saw

You could also do it with a hand held coping saw

But it would be alot of work and difficult to get good square, smooth results with the coping saw.
It takes some practice & skill, and/or a good bit of sanding & filing to get those nice smooth cuts with either tool. You'll also need a drill & bits to drill out the tighter corners - either of the tools, with the possible exception of the scroll saw, will have some trouble cutting some of those smaller radius inside corners without drilling it out first.
It looks like you are dealing w/ a thin material. I think a Dremel tool would be able to easily cut thru it while providing the accuracy and maneuverability needed.
It is also fairly inexpensive as it is more suited for craft and lightweight DIY projects.
https://express.google.com/u/0/product/18390795439829211245_7899309295047230687_6136318