It looks like as if it could be a multivibrator to me also, what I see as a first look.
The 2N2222 has a negative supply on its collector.
I do not fully understand the op-amp circuit - that will take some thought. It is not the usual mixture of positive and negative feedback.
The loop C3, D2, R5 does nothing.
D1 is connected to ground, so where is the output?