Hello,
Currently on ebay is a photo of Lockheed AT-18 42-55689 at:
https://www.ebay.com/itm/Lockheed-AT...0AAOSwMnde8RN3
I can't of course say whether it definitely operated on the pacific side of the USA.Has anyone more on the unit operating this particular AT-18. Also full disclosure, late night eyes again, so I hope I've not misread the serial.
Regards,
Clint