I was talking with Randall Noguchi today on IRC chat. He had some photo links from the Ala Wai Thunderbolt siren test back in 2010 after it malfunctioned during a Tsunami warning. Personally I have never seen what was in these wooden boxes. So I was very excited to see these photos.
This Thunderbolt 1000AT looks like it was installed somewhere around the mid 60's or late 60's. It has a A2 5M blower.