Looks like the stalk. Pulling it fully forward would be the momentary main beam flash.

There should be no separate dip or main beam fuse for that year. A blown filament would affect only one side of course.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone