Don't look to far Jeff has it all covered here:
It is the one on the right.
http://www.onthedash.com/watch/comparisons-of-master-times/

Hope that helps
Regards
Juerg
www.Artomatique.net

: Doing some research on Heuer 8 days timers and found some reference
: to an Arogno Cal. 28 (for instance here:
: https://www.bukowskis.com/en/auctions/600/12-heuer-master-time-8-days-and-monte-carlo-stop-watch-dash-mounted-timepieces-57-5-x-57-5-mm
: and here
: https://www.worthpoint.com/worthopedia/heuer-master-time-rally-timer-68-75-1899562099
: ). This brand has managed completely to evade me but also the
: internet. Anyone who has a pic of this movement? Even Ranfft
: does not have one