What "reverse printing" do you mean?
They use the same date and weekday discs, regardless the way they turn the movement. It does not matter at all whether they cut the hole for the weekday into the dial at 3 or 9 o'clock.
Just look here: http://www.sinn.de/Modell/917.htm (also available in English)
It says clearly: "Zusatzoption Englischer Wochentag: 0,00 €" Optional feature Days of week in English: 0,00 €)
HappyDay989: Excuse me for my possible stupidity but though I see the whole Sinn website and the detailed 917 desciption in English too but I could not find that's written that Sinn offers the 917 with an English weekday too - not even by clicking on the link you've placed here. And yes, if you save the scan of any "normal" 7750 and rotate the scan by 180 grades you'll see the weekday upside down. So when you rotate the movement and don't open the weekday (and date) window on the other side you have to print an upside down weekday (and date) disc. Ther is a kind of Fortis B-42 where the movement is not turned but they've opened the weekday window at the left to the center hands and they also needed an upside down weekday disc. So either I could convince you or I need further clarification - written in German is fine with me only my poor German grammar makes me write in English.
Best regards from beautiful Budapest, with one of my two Sinns just on my wrist ![]()
Robert