My Norwood 05A Z28 has the valve, date stamped 108-9, or April 8th, 1969.
I was going to post a question to confirm the date coding on these valves, but it appears from this discussion that they are stamped with a Julian date code.
The valve is also stamped "KH" and "R" (see picture attached). I assume the “R” indicated the rear or outlet side of the valve; however, the tab and hole in the bracket position the valve in one position.
Does anyone know that the “KH” stamp indicates? Is this the manufacturer?