1960's Hamm's beer tap knobs-San Francisco Brw'g.

These were acquired from the son of a brewery worker.Hamm's had a San Francisco plant,that they bought from ACME,from 1957-72.I believe these may have been a display somewhere,as they all have machined brass bases,that the tap knobs screw into.The "black beer" was news to me.I knew they brewed a DARK beer,but had never heard of the black brew.My wife's Grandpa was the Hamm's brewmaster here in St. Paul,so these found a "loving home"