Thanks very much, MoK. I can't seem to find the exact watch (Casiotron R-16). Maybe I'll have to dig deeper. Would be nice to get the exact date and details.
Unfortunately, my father didn't get to hand it down to me. My brothers and I found it in a box with some of the few belongings of him that we have left when sorting out my mother's apartment. Hence the "wearing with pride" comment .
It looks like the R15 and R16 were pretty identical: http://www.digitalwatchlibrary.com/DWL/1work/casio-r-152/