A rough summary of the Léopoldoff
Colibri variants ...
Léopoldoff L 3 -- (Orig.) 1932; 35 hp Anzani Y-3; span 8.71
Léopoldoff L 3 -- (Mod.) 1935 45 hp Salmson 9 Abd radial
Léopoldoff L 3 -- (série) initial, Aucouturier-Dugoua & Cie
Léopoldoff L 3 -- (série) later, Société des Avions Leopoldoff
- CAM-1: Société des Constructions Aeronautiques du Maroc
Léopoldoff L 31 - L 3 w/ 50 hp Boitel 5Ao
Soleil radial
Léopoldoff L 32 - L 3 w/ 60 hp Walter
Mikron II 4-cyl.
Léopoldoff L 4 -- Post-WW2 production variant of L 3
Léopoldoff L 5 --
hypothetical designation
Léopoldoff L 53 - 75 hp Minié 4.DC.32 HO4 engine
Léopoldoff L 55 - 90 hp Continental C90 HO4 engine
Léopoldoff L 6 -- Reinforced wings; Régnier or Minié*
-- * Presum. 65 hp Régnier 4J & 65 hp Minié 4.DF.28
Léopoldoff L 7 -- L 3 re-eng. w/ 52 hp Beaussier
Héron
-- L 7 later re-engined with 65 hp Continental A65-8S HO4
One presumes that there was an 'L 5' planned but I've found no evidence of it.