THE ULTIMATE CITIZEN RECORDMASTER COLLECTORS GUIDE
It seems that before production began on the first model Citizen recordmaster a prototype was manufactured with the name Citizen sportsmaster. There is an example that can be found on display at the Citizen museum in Tokyo, Japan.
I have no idea how many of these samples were made or why Citizen decided to change the name from sportsmaster to recordmaster presumably before mass manufacturing began.
If I ever learn anything more about it i'll be sure to pass it on.
Photo comes courtesy of my friend at vintagecitizenwatches.com.