M-1A: Original two-seat version with Walter Minor engine M-1B: Similar to M-1A but with ZLAS Toma 4 engine, 1 built M-1C: Revised version, with longer fuselage and third seat, 183 built M-1D: Similar to M-1C with new, single-piece canopy and larger rear windows, 104 built M-1E: Similar to M-1D but equipped with pontoons, 1 built
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