Bob, prod number are 283 .... but officiel documents from " service des mines" that alloys legal production start with all technical infos about one model, starts at number "1036 ( prototype) "......
you own the 1015 ...GD in France owns the 1019-1022(inter alu plate is different from chassis ) , so it would give 319 inter builts with JLP 1308 as the biggest number chassis registred ..
a guy from Villeurbanne factory, told me that after the end of that inter story, a man in Lyon had bought all parts, chassis from the SNCAN factory, and tried to sold some INters rebuilt with them ... is 1308 made with , and in fact " extra prod" numbers ?? actually, i don't know ..