Well, there is no way to know for sure, each day would have been different, but we can average the known numbers and get close.

• The VINs assigned started with VIN 100001.
  


• The highest VIN currently known is above 443001.
  


• The 1970 model year ran from August 1st, 1969 until July 31st, 1970.
  


• So we know that at least 343,000 cars were actually built on Hamtramck's two assembly lines.
  


• If we take 365 days a year, minus 104 for weekend days, that leaves 261 days.
  


• I am not sure what holidays were allowed off, but we can safely assume five I bet? That leaves 256 possible production days.
  


• 343,000 cars divided by 256 days gives us an average of 1339.84 cars per day from this plant.