The medal commemorates the first test-launch of the Energia launch rocket. The Energia was designed to launch the Buran space shuttle, but since the Buran program was cancelled after just one flight, the Energia ended up only being used twice - this first test in 1987, and the one test flight in 1988 with the Buran.
As the Energia was and remains a discontinued and embarrassing "failure", I highly doubt there would be any subsequent commemoration of the event, so the medal must actually date from 1987. I believe the reverse inscription says (in Russian) that the medallion was made from metal used to produce the Energia.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis