z1r: I am aware of a large vacuum of information concerning early postwar Brno rifle production, most of it centered on the ZG47. Some of it plainly contradictory and also as perpetuated by original sources simply wrong. I began my research as first having bought a beautiful Brno rifle and attempting to learn about it. This event decades ago in 'Jurassic'
pre-Internet era. Perhaps worse, there is now a residual hodge-podge of information out there, only time fading toward irrelevant!
Here are the facts as I understand them as supplemented by my rifles. The ZG 47 rifle was designed by Otakar Galas in 1947. Indeed the model designation ZG47, reflected both the year referenced as well as the "G" honoring Galas. Due to external Soviet productivity mandates, manufacture of the Models 21 - half stock and 22 - full stock Brno rifles continued in progress until at least 1950. In that year, the ZG47 was finally introduced in small ring action format. That production, into 1951 and possibly bit later, was 'relatively' small & short-lived. From then, a hiatus period began as Brno was tasked by Soviet leadership with development and later production of military weapons. Only by sometime in mid nineteen fifties, a Brno sporting rifle was introduced. It of large ring pattern and otherwise differing design than 'of old'. Significantly, such yet utilizing the same ZG47 designation. From that fact, an endemic problem arising and considerable resulting confusion incurred. Viewing factually differing model rifles wearing same nomenclature!
The original pattern rifle, of which I have two, is said as noted, to have been low in relative numbers and "rare". I the decades since I purchased the first specimen only to have viewed three other specimens first hand. The second viewed, I made mine. Another 'not for sale'. Last, simply overpriced. I've also seen the later edition somewhat more often yet still suggesting likely never in huge numbers. It perhaps made into the sixties? I'm unsure, but that also not on point here.
Of my several Models 21 and 22, production dates as "47" & "48". I've noted an interesting evolution in my own specimens of those models, but too far afield for discussion here.
Brno was not alone in utilizing the same model designator for notably differing configuration rifles. Husqvarna yet takes the cake in "Model 640" designation, reflecting their rifles of both "96" pattern and "98" pattern models... Oh my! Also both such Husqvarnas and these rifles under consideration; European style of era, not reflecting model number within rifle nomenclature!
By bow, the fact of the little known/short lived "first series" of ZG47 rifles, strongly contributing to the perpetuation of confusion and attempts to link differing characteristics as one single configured rifle.
My "best factual evidence", reiterating 'in 'possession' as reflected in the previous pix above & contemporary pix below. Here "5 pix limit" reflecting most evidentiary-relevant details.
Best & Keep Safe!
John