That's a wonderful example of the Porter-Cable BS, made between 1925-1935 or so. Your guards are OEM with the addition of sheet metal; the originals were open ( since the saw has solid wheels, there's less need to protect the operator- no spikes to stick an appendage into while the saw is running ). I can't see what that saw has for a motor and drive, but if it retained the original gearbox, you're a lucky man.
The first version of this saw ( made by Syracuse Sander ) debuted around 1918, and had the motor mounted outboard, to the left of the operator. The drive was via sprockets and a silent, or leaf, chain. This is what my black band saw would have originally had, but these band saws are almost always missing the original drive system. The improved version moved the motor into a sort of doghouse in the casting, and all Porter-Cable did ( after buying Syracuse in 1922 ) was add some guards and a few gearing variations ( although the metal cutting version also gained a square table with a built-in in fence and rail system ).
Your saw would have been a blueish gray new ( I use new Ford gray ), and was one of the nicest band saws of it's class. The only drawback is the difficulty of mounting a fence to a round table.
- James Huston