Here is my video of Frankie's restored P-10 that was originally in service in Watertown, WI and it was the only reverse wired unit in their system. Now it is effectively fully restored and was wired the right way, hence why we growled it to make sure the chopper was spinning counterclockwise. As soon as I confirmed this, I gave 2 thumbs up.
Just like the STH-10A, this P-10 was initially running on 2 phases which explains the slower wind up and lower peak pitch. Thankfully nothing went horribly wrong, but a few people noted an overheating smell coming from the motor after the first run. When we ran it for the 2nd attack after Sam C fixed the phase imbalance in the generator, it wound up and sounded much better.
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Video of this siren when it was still in service: • Watertown, WI ACA P-10...