You may have found an error. I saw several Morocco stamps on Auction with one of the several possible o/p missing (the 5c, 10c 15c and 25c missing are noted in Scott). I don't know if this one specifically is noted in specialty catalogs, but it is possibly an error.
rrr..
I found a reference for the lack of Arabic overprint and it is possible that the stamp also has the "S" variety reversed.
You have the address at the top.
The lack overprint exist and it is mentioned on French catalogue Yvert & Tellier,
however the 20 c is not mentioned.
I think you can ask them.
I think they are specialized in these stamps.
SG lists these same five stamps with omitted surcharge (as listed in Y&T) but again not the 20c.
re: French protectorate surcharge on French Morocco stamp
You may have found an error. I saw several Morocco stamps on Auction with one of the several possible o/p missing (the 5c, 10c 15c and 25c missing are noted in Scott). I don't know if this one specifically is noted in specialty catalogs, but it is possibly an error.
rrr..
re: French protectorate surcharge on French Morocco stamp
I found a reference for the lack of Arabic overprint and it is possible that the stamp also has the "S" variety reversed.
You have the address at the top.
re: French protectorate surcharge on French Morocco stamp
I think you can ask them.
I think they are specialized in these stamps.
re: French protectorate surcharge on French Morocco stamp
SG lists these same five stamps with omitted surcharge (as listed in Y&T) but again not the 20c.