74 Dart won't start - ignition switch - maybe starter relay?

Well, mine is a 75 and it has it. I bypassed it but didn’t remove anything so all of the components are still in place including the switches under the front seats. The car’s engine is dated Sept 74. Assuming it would’ve soon after been put in a car on the line, what does that say about early or late?

August each year was the first month of production for the next model year. Yours being built in September means it’s also an early built 75 model year which explains why it had it. Leftover stuff from the previous model year.