Double sided letterpress printing. We get this question often. Can it be done? YES! But there are some things to be aware of. First and foremost, printing on side A will leave slight ghosted residual impression marks on side B. We can certianly dial back the impression to minimize these marks but that sort of defeats the purpose of letterpress, don't you think?? So you still want to double side your print and you want a nice, notable impression? No problem. Our best suggestions would be to either print on a duplex sheet (2 sheets glued together back to back to create a thicker sheet) or our 2-ply (double thick stock direct from the mill). Both will allow for a very nice impression with little to no damage to the reverse side. Pictured below is a job we recently finished which includes an example of double sided letterpress printing on 2-ply paper. Note the impression marks from each side are practically invisible.
*One additional advantage to the 2-ply is that if you are considering a painted edge, the extra thick stock yields great results!