Above is a pic of what sometimes is presented to me as SN31 CREB145. However, I have cataloged three different, very similar looking (same size and style of font - maybe the same engraver) SN3 moulds that were all converted into number 13's. One of these SN3's was backwards and is pictured). This backward number 3 mould was converted to a SN13 along with its "brothers" that also were turned into 13's. It just so happened that when the backward SN3 was made into a SN13, it looks like a number 31. Now, of course, this is theory, but the similarities between the moulds strongly suggest this idea to be correct.[id=101434724] to see one of the alleged SN60's