It does look like the valves themselves (with tube stubs) were vendor-supplied. Could be two different vendors at two different times. Those look like modern

It does look like the valves themselves (with tube stubs) were vendor-supplied. Could be two different vendors at two different times. Those look like modern forged tapered-stem stopcock valves, probably hand fabricated to arrive at a product not much different than a machine shop would make today. The manifold/tank could have been made from hammered and welded sheet with end(s) somewhat removable for occasional maintenance. Looks like maybe places for a couple more taps to the right of the two that are in there now. Like today, the plumbers were the ones who put the parts together and ran the pipes to the points-of-use.