NFLD #1 Or 15A With Decent Repair Job

This was a steal due to the repair but faces up quite nice. Was listed as a #1 and I just bought a #1 recently but couldn't help myself. The repair is solid and doesn't seem to be any glue residue but loking at the back it looks to be a roman numeral 5 in pencil. Since both the #1 and 15a were from same plates and one color is violet brown and the other brownish violet I'm stumped to the difference. Any thoughts as to be sure which is which? Last pic is presumably the #1 no faults.