LF/MF, 30KHz-2MHz, 50, 250, 500W. No slugs needed.

Ex-NAV Canada, likely LORAN etc use.

This is what you need for the lower bands in CW antenna system tests.

Bayly Engineering  was a Canadian company, supplying mainly to railway and government. Very good quality. Bayly got their start during Camp X in Ajax, ON during the second world war.