I have 2016 Charlton and I have no incentive to buy a newer revision.
For proof one cents it lists very little info except some absurd prices.
From the set's specification
1 cent: Composition - 99.9% Cu, Weight 2.50 g, Diameter 19.10 mm, Edge - Plain
Mintage (sold) - 63562.
This is a common coin, since many of 2005 sets were broken to get the gold-plated dollar.