The Siren Board

I found this siren in Blackstone, Massachusetts. It is hard to identify due to the damaged housing. It looks like a Darley Model 2 and an Aut-O-Matic OC9 at the same time.

I think it's just a Darley Model 2 with a damaged housing. But, there is a tiny possibility it could be something else.

Seconding that it's a Darley Model 2. It looks like the helmet rusted partway through around the edge.