Tadddddddaaaaaaaaaammmmmmm ....
Après moult circonvolutions webesques, je tiens enfin une réponse qui me semble viable, car tirée du précis et reconnu expert (oui oui puisque je vous le dis ..
), site "
www.achtungpanzer.com/stug.htm".
Concernant la version G du StuG III, construit à partir de décembre 1942, il dit (entre autre) :
" ... the other changes included the layout of the roof, addition of commander's cupola with seven periscopes (each could be moved up or down) and sighting flap for binocular spotting telescope along with a 10mm machine gun shield in front of loader's hatch (from December of 1942 to April of 1944). Early vehicles had movable cupola (until October of 1943), mid vehicles had it mounted in a fixed position (until October of 1944) and late vehicles again had movable cupola with additional protective cover. Also, early vehicles had 50mm frontal hull armor increased to 80mm by addition of 30mm bolted armor plate, while vehicles produced since May of 1943 by Alkett and since October of 1943 by MIAG had 80mm frontal hull armor. Early models were also mounted with KFF2 (Kampfwagen Fahrer Fernrohr) driver's episcopes ... "
Ce qui tendrait à prouver que la MG34 était déja montée ... 
Je ne vais pas être obligé de me faire passer pour Belge, l'honneur est sauf (j'aurais préféré avouer sous la torture que j'avais tort 
).
PS : et puis pour l'Honneur de la Belgique, je ne sais pas si ça aurait été bon que je me dise d'Outre-Quiévrain ... 