When I push down on the shutter button it stays open as long as the button is pressed.
I wouldn't use grease anywhere in any shutter unless specifically called for by a repair manual.
The rotary shutters in most box cameras have a rivet for the pivot, and tiny drop of very light oil on that pivot (at the edge of the rivet head, it'll wick under) is the only lubrication I'd recommend for one. I don't think 1/30 is far off for a camera in this class -- I remembering thinking mine was 1/60, but it's been a long time and I never actually measured it. Don't forget, film was typically slow in the 1950s, with consumer B&W running ASA 50-64 (before the ASA ratings of most films doubled in 1960), so 1/30 to 1/60 is a reasonable figure for a camera with f/11 to f/16 aperture and a recommendation to use in full daylight or with flash.
Can't find this cutter anywhere else.
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