Beautiful BU. Aero US. Navy Waltham 8 day clock, what is it out of?

[Larboard]

Very nicely preserved 8 day clock, everything works, no signs of tampering, missing screws, etc.

Few questions about this, I assume it's out of an aircraft, but which ones?

Nicely marked on the back, with a large anchor inside US on the back, has been very well kept in a case since its removal. Collector/seller seemed to thing the lettering at the bottom of the stenciled inscription was unusual, "PER.386", in fact I don't see anything like this on any of the recently sold one on the net.

Any idea what this signifies?

Thx much for your time in replying.

[Ubique]

This website mentions the Lockheed Ventura:
Waltham Aircraft Clocks
Although I would not be surprised if they were fitted to several types.

Oz.

[big ned]

These Waltham CDIA clocks were fairly standard in US Navy/Marine Corps aircraft that included besides the Ventura, the Avenger, PBY Catalina, Corsair, Hellcat, Helldiver, Havoc, Dauntless and the PBM Mariner. There are probably many more.

Regards, Ned.