It’s certainly looks like a pinwheel type of escapement. And from what I can see it’s a Portico style clock. It has a calendar day and date in the 2 side sub dials.
I’m presuming the centre hand is a seconds hand? I’m wondering if it’s actually a mock visible escapement?
San you post pictures of the entire clock, rear view of the movement and side views of the movement? This would help in trying to answer some questions.
I don't see a reason to doubt the escapement. It looks workable to me. It's a very interesting pin wheel design though. It would be interesting to know who made it. I'm guessing that it's pretty rare - maybe even a prototype.
I’m questioning it only based on it having 5 pins and a rough drop of 8-10 inches! That pendulum is going to to be swinging mighty fast! or slow!
That and if you look at it closely it’s got a very odd hook or tip on the right side of the fork? Not to mention no support for the fork?
Doubting, No. Questioning and asking for more pictures to try and establish design, Yes.
I was only hypothesizing as to whether it functioned or not.