This is an idea for a flag of Cuba. I'm working out a timeline for the state and have pretty much decided on an earlier revolution against Spanish rule, no later than 1850. I want the flag to look like it comes from that era. The key represents Cuba's role as "Key to the Americas," which is also in the OTL coat of arms. The red stripe (maybe too predictably, I don't know) represents both the land of Cuba and the red blood of patriotism. This is surrounded by blue as Cuba is surrounded by the sea.