Rod,
I realize this won't directly answer your Scott question, but it might help with IDing these. Michel lists two sets of 4 in 1996 — a perf 13:13 1/4 set (Sc 913-914) and a perf 13 1/2:13 set (Sc 912-912C)

MiNr. 1173 (1996), Sc 913-914 — 4 values perf 13:13 1/4 — note the "POSTES 1996" text

MiNr. 1177-1180 (1996), Sc 912-912C — 4 values perf 13 1/2 : 13 — note no "POSTES 1996" text and text rearranged
They list another set of 4 in 1997 (Sc. 935-938), with new fonts and text palcement

MiNr. 1272-1275 (1997), Sc 935-938 — 4 values perf 13 1/4