2014 Transformers 4 Coin Set – 1 Oz. Optimus Prime, Bumblebee and Lockdown. Colorized Silver Proof Lenticular Coins from Perth Mint! Mint Condition – Proof Finish. Limited Edition Mintage: 5000 each. Includes: Numbered COA for each coin as pictured. 9999% Silver Weight: 1 Troy Ounce. Track Page Views With. Auctiva’s FREE Counter.