Many thanks to SRAA contributor, Dan Greenall who shares the following recording and notes:

Reception location: Ancaster, Ontario, Canada

Receiver and antenna: Hallicrafters S-52 using a longwire antenna

Notes: Prior to July 1, 1971, time and standard frequency station WWV in Fort Collins, Colorado was giving ID's in Morse code as well as voice every 5 minutes. They were best heard here in southern Ontario, Canada on 10 and 15 MHz.