Thanks Chris for MM article.I always heard from older wing club newsletter sources it was 440-4SPD-US-139 440-AT-294-US.For 433 + 70-426 48 AT-22-4SPEED=70.To the 503 US number. Canada not included.The 503 with 50 additional Canada 45 440 + 5 426=50 is 553.But who knows exactly they cheated on the 69 charger 500 count by running cars past nascar inspectors twice and made 392.And not 500 required.I think the daytona total is around 505 and maybe a few over then that.But the 503 number has stood the test of time. And earlier post by HEMICAR1971 collborates the 50 Canada cars by the Chrysler Historical as his source.And were at 553 again but who know if more car will surface to change it.And superbirds are numbers from 1920-1935.The vermont car is #73 XX29L9B390010 C.H GOSS CO BURLINGTON VT