wuzak
Captain
During early '70s I saw a war movie about the Battle of El Alamein.
"Battle stations!" a British sentinel shouted "a Division of Italian tanks is coming to us!"
Clearly silouetted against the sunset light there were half a dozen of … M-47s.
If Italians have had M-47s at the battle of El Alamein I think history could have been a little bit different….
That is not an attempt to change history, but rather working with what they had. Doubtless the period accurate Italian Tanks were hard to come by, so they used a substitute. Similarly the aircraft in Battle of Britain were not accurate, but they had to work with their budget and what was available.
Now, of course, budgets for such movies tend to be bigger and CGI can be used to create realistic period vehicles.