Need Help With British Stamp Overprinted Morocco, In Centime

Please do not laugh at a novice. I have a block of 4 Great Britain stamps overprinted Morocco Agencies, denominated 3 centimes. I have looked for an hour in my 2009 Scott's (the most recent I own) under Morocco, Great Britain, and Spanish Morocco. I cannot find the stamp. I think I just overlooked it, but maybe I was looking under the wrong country heading? What is the Scott number, the proper country to look under, and approx. worth? Mint never hinged, OG. Thank you in advance.

Try taking a look here:

http://www.gbos.org.uk/index.php/Country_List/30

Thanks Cephus...I did find this site but could find no information here that helped me to find the stamp in Scott's.

hi lkkoller your stamp is a french currency stamp scott #401 issued from 1917-24 you will find this under Great Britain, british offices
abroad-Morocco. hope this helps.

"...hope this helps". I'll say! I swear I was on that page. Thanks for the information, it is greatly appreciated.