Quasar Analog-Digital 1989, Japan Miyota Cal. TL11
I do not remember having gotten this watch in 1973... 1973 was the year of the tuning fork watches. Solid state inexpensive Quartz watches followed in the late 70ies and completely reshaped the watch industry. Only in the mid 80ies, the mechanical watches were back in business, and what business!
I think Model Nr. 73, 1989, July might be a way to read this number, just my guess. If you know for sure, please mail me at retoNO@CLAMloxinfo.co.th. Right after I typed this, I had a look at the movement shot and found the movement production sticker 11.88.