Crane Post 1947 to 1970 Drexel or Marcia Lavatory sink Cartridge stop. For this stop to be correct, the sink HAS to have a ceramic (integral) spout. Overall length is just under 7/8″ long (.903″) Made in the USA.
Pipe thread sealant must be applied on threads.
Valves need to be flushed after stop is installed.