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I assumed that mould marks would be a sure identifier, however, looking at two that are vintage and comparing them to the 40th, it's not quite as clear cut.
The mould marks on the vintage guns are on different sides to each other. Makes sense, as there would have been many moulds on a tray. I've got 4 vintage officer caps and the marks differ on those too. The top two are vintage, but you can see from the photo that it's the middle one that looks the odd one out.
The 40th version has slightly sharper lines where they've cleaned the master copy up before producing a new mould. Also, the plastic is a bit shinier on the repro, but that may be down to its youth.
Definately harder to spot than a 40th SLR. The line around the base of the butt, which is deeper, seems to be the only give away.