Very early Longines Flagship 30L with arrow indexes

G gcalin

how did you figure out the dial is not original?

Syrte

Another important sign is the execution of the subdial: does it retain the usual concentric marks, are the subdial index uneven or are the consistent? Compare the subdial on the OP and on the one you posted (I just magnified the subdials from the pictures both of you posted).(nice dial on that first one, by the way- and you can also see the « Flagship » signature is much finer and crisp on the first dial vs coarse on the second.)