I nearly forgot! Launched last month on the 16th of November, 40 years ago! Launched in 1974 on a Delta 2310, this old bird is still doing meaningful work.
After going offline in 1981, OSCAR 7 was presumed dead. 21 years later, it's beacon was heard once again, and since then, it has been semi-functional, though it's batteries are long dead, and it can only operate when receiving light on it's pv's. From
http://oscar.dcarr.org/ it was most recently heard this morning.