1965 Dodge Dart Charger convertible

Today I did the last paint removal. Tomorrow it's time to weld the 12 holes.
But when closer examination I found a special stamping that I never seen before. On the upper cowl is a stamping TS 45. Has anyone seen this before? I was wondering if it was the suppliers number on this stamped plate. Not sure if Chrysler stamped this one in their own production. Or if TS is the supplier and 4 stands for year 1964 and 5 stands for month of production.
Any guesses?

20190709_190846.jpg

20190709_190852.jpg