2025 Astronomical Observatories Medallion Cover PMC

This 2025 Astronomical Observatories Medallion Cover PMC showcases a limited medallion paired with a matching stamp from the Astronomical Observatories series. Highlighting Australia's exceptional conditions for southern sky observation, it features three key ground-based observatories along with their historic or current optical telescopes. Ideal for collectors and astronomy enthusiasts, this cover celebrates Australia's vital contributions to astronomical research and space exploration.