First edition, early Chronomatic 3-6-9-12 dial with horizontal lines across the hour markers.
Non-Chronomatic main dial, 3-6-9-12 hour sub-dial but with same 1st edition hour markers (ad printed end of 1969). Note the pointed 'V' in Autavia and the placement of 'AUTOMATIC' below the subdials.
And below we have a later style, again with same 3-6-9-12 hour sub-dial but with next generation hour markers.
Note this time the placement of 'AUTOMATIC' in line with the subdials.I guess this makes my 'Schmitz' style 3-6-9-12 a transitional model immediately following the 'Chronomatic' version.