I dont know anything about a Hwaukee Brass HOWEVER the Milwaukee Brass Man made thousands of spigot's in the early 1900's such as yours and were VERY popular. They have been out of business for a very long time now.. I wanna say even before WW2 but I may be wrong. I BELIEVE you have a MBM spigot.. neat find.. here is some info: https://archive.org/details/MilwaukeeBrassManufacturingCompany0001