well copper so far you make cents lol I have few over each of the 60and the 60-d smalls small date about 100 of each in my safety deposit box I keep finding them the and the70-s I have just 8 of them.. and the 79 type 1 and 2 and 81 typ1 and 2 13 of those I just collect to have fun and give to my kids college funds 8 full sets of the 82 copper & copper zinc sets I collect when the first came out I bought a few roll then I cant even begin to go in to the a.m. pieces I have.. not stopped finding them I use to get roll 20 dollars at a time .. the late wife said enough so I stopped oh what a mistake... now I got out of the Cooper side and just roll and store all I have now I'm a half freak lol oooohhhh no I've gone through about $3000.so far and just keep die errors no fg, aw... so I can understand all I have read and enjoy the reading material it helps me understand a lot about my hobby I don't sell and thing I have collected that's up to my kids to do that or to carry it on