Sinn’s Cal. SZ03 is an automatic chronograph movement based on the ETA 7750.
Sinn has long used the ETA/Valjoux 7750 movement for their chronograph watches, but began reworking the movement in the 2003 as the SZ01. This was followed in 2014 by this Cal. SZ03. In addition to a 60 minute (rather than 30 minute) chronograph counter at 12:00, as in Cal. SZ02, Cal. SZ03 features an unusual calendar arrangement: Windows at 12:00 show the day of week and month, a central pointer shows the date, and the subdial at 6:00 shows the week number.
This movement was used in the Sinn 6052 Frankfurt Financial District Watch with calendar week display.