A Google search turns up photos of a few beacon transmitters onboard Lightships.  In a photo of what appears to be the same type transmitter as on the Delaware ship can be seen a schematic with the transmitter being a model TB-142.

https://www.oregonstockphotos.com/photo-gallery-industrial-nautical-marine-maritime-photos-1.php

The transmitters aboard the Huron museum ship at Port Huron, MI:

http://travelthemitten.com/landmarks/photo-gallery-friday-huron-lightship-museum-port-huron/attachment/lightship-huron-radio-controls-communications-michigan-museum/

And in this Getty Images photo of a different transmitter the nameplate can be clearly read to show the frequency coverage of 300-500 Kc.

https://www.gettyimages.com/detail/news-photo/the-radio-beacon-transmitter-aboard-a-lightship-this-250-news-photo/541665620

Sean - W0KPX

-----Original Message-----
From: "Ray Fantini" <RAFANTINI@salisbury.edu>
Sent: Thursday, December 2, 2021 8:40am
To: "milsurplus@mailman.qth.net" <milsurplus@mailman.qth.net>
Subject: [Milsurplus] Lighthouse radio beacons of the past ?