Fantastic set of Polish space stamps, called 'Conquest of Space', issued in 1963. Loving the detail of the trajectory/orbital diagrams:
Via Space & Astronomy Stamps
Łunnik 2 looks more like a football!... apparently this was the first probe to 'hit' the Moon. From Wikipedia:
Luna 2 (E-1A series) was the second of the Soviet Union's Luna programme spacecraft launched to the Moon. It was the first spacecraft to reach the surface of the Moon. It successfully impacted with the lunar surface east of Mare Serenitatis near the craters Aristides, Archimedes, and Autolycus.
List of man-made objects on the Moon