User talk:47.156.187.188

The first appearance of Metallo is Superboy #49 and not Action Comics #252
https://comics.ha.com/itm/silver-age-1956-1969-/superhero/superboy-49-dc-1956-cgc-vf-80-off-white-pages/a/122111-15588.s?ic2=mybidspage-lotlinks-12202013&tab=MyBids-101116