OK - have found out more - beside basic difference of barrel forging between 140A and 140A-2, looks like there is no difference between 2 and 2.1 but engraving (no weight difference?) + there is also 2.2:

Model 140-2 features standard arabesque engraving.
140-2.1 Engraved features full coverage hand engraved African game scenes.
140-2.2 Custom engraved models with octagon barrels, ordinary barrel forging.

Letter "E" means that rifle is equiped with ejectors.