It is a user-generated catalog!
Non-magnetic

Cupronickel, 7 g, ⌀ 27 mm
Added by CoinBrothers 22 minutes ago

Brass Plated Steel, 5.9 g, ⌀ 26.1 mm
Added by CoinBrothers 32 minutes ago
Robotics

Silver Niobium Coin

Niobium, 16.5 g, ⌀ 34 mm
Added by CoinBrothers 1 day
International Year of Astronomy

Silver Niobium Coin

Bi-Metallic, 16.5 g, ⌀ 34 mm
Added by CoinBrothers 1 day
Austrian Aviation

Silver Niobium Coin

Bi-Metallic, 16.5 g, ⌀ 34 mm
Added by CoinBrothers 1 day
It is a user-generated catalog!