You can measure it however you'd like. Language, scenery, costume, events, etc.
La Terreur et la Vertu is about the French Revolution, and is basically a blow-by-blow re-enactment of the fall of Danton and Robespierre. Unfortunately that makes large parts of it boring as shit because they really do show all the political fighting going on instead of replacing it with personal conflicts like most fictional versions do. My biggest complaint is that Robespierre wears his powdered wig to bed.
I loved watching a film called Winstanley by Kevin Brownlow, it is sort of a pean to the Diggers, a communistic sect who started occupying common lands to be held and farmed and common during the Interregnum (when England, Scotland and Ireland had no King).
It's very low-budget and was made in the seventies, but because it was made by left wingers in a period of left wing forment in Britain, I think it reflects the urgency and revolutionary feeling of people in the radical sects in Britain in the 1650s.
Hi! You'll find several more recommendations in the FAQ*
*see the link on the sidebar or the wiki tab