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The colour plates include 4 G vehicles said to be from Russia 1943 & '44, and the Balkans '44. These feature the welded mantlet- 2 different schurzen formats, but no apparent zim (though some of the "in Russia" photos of G do have zim, and others, not). On p32 is what is claimed to be a pic of a column of G in France in 1944- with schurzen, welded mantlets and apparently no zim. (and captioned in ref to units there for refit or training). The adjacent pic, of an "early G" in Italy, 1943, shows the version lacking the cupola-deflector, and w/out zim or schurzen. P48 shows 2 late-war G from Germany (1945) which have some "early" features, such as welded mantlets (but with the co-axial MG) - and a rundumfeuer MG on top- no zim, but schurzen.
I have this same reference and know the color plates you're referring to. As you've discovered, dating things by certain features alone such as the mantlet type isn't an exact science. The text for the color plates also isn't very precise in the timeframes stated so must be taken with a grain of salt when checking their respective features. Considering when zim was introduced (and discontinued), when Schurzen were introduced (and changed), and when different mantlet types were introduced (as well as other features like the rundumfeurer MG), and you have the opportunity for overlap since none of those features were introduced together at the same time. The German production lines followed a general practice of using up existing stocks in production before converting over to new features/changes, so there's always going to be some fuzziness involved depending. The block-style mantlet for example continued to be used right up through the end in 1945 side-by-side when the cast-style mantlet was introduced because it was expedient to continue to produce them simultaneously to keep up with demand. As you point out, the block style mantlet underwent some of its own adaptations including the introduction of the coaxial MG to keep pace with similar adaptations made to the cast mantlet (ironically the block-style mantlet w/coaxial was introduced into production before the cast-style by a couple of months).
Comparing the combination of different features allows you to get a pretty close approximation of when a particular StuG was produced during the production run, sometimes down to a specific month, sometimes to a range of months, but that's as precise as it gets. There aren't official "early", "mid", "late" designations, these are just modeler-terms applied for convenience sake to try to organize this.
As for the pic you reference for the StuGs in Normandy, you have to look closer...the nearest vehicle in that column clearly has zim on the rear plates and has the distinctive Alkett waffle-type pattern.

These are posted for discussion purposes only.
Paul,
Sorry to hijack your thread a bit but as you can see when it comes to StuGs, setting an exact timeframe is a little tricky. If you want to change your setting to reflect the configuration of your Tamiya kit, I would suggest any theater pre-June 1943 for minimum hassle. That would mean you could depict this StuG in one of three main locations (Eastern Front, Italy, or France as a refit vehicle) that would suit that time period.

Ultimately it's your model and there aren't any model police out there who will come knocking on your door demanding proof that your