I'd wager they are original - they seem to be the special type that clamps to the seat stays and the fork blades, rather than bolting through the bridge and the fork crown. The Philco works sort of like a cross between a center pull and a cantilever brake, but there did exist traditional side-pull calipers as well. Your seat stay bridge and fork crown may be drilled in such a way that they cannot mount brake bolts, so that clamp-on type caliper would be necessary and would be period correct for that era.
The shifter looks like a later type. The most common shifter in 1941 was the top-tube quadrant, though there was a long-arm handle bar type with embossed face plate. The earliest handlebar shifters from the 1938-48 era would be something close to this: