The bike pictured at this website looks older than yours, but the bottom head tube lug definitely has the "M" you refer to, and the headbadge shares many details: https://www.thespoken.cc/motoconfort-around-towner

It's no help to identify the model of your father's bike, but it's easy on the eyes nevertheless. I love the blue you chose for the powder coat. Looking forward to seeing more pics, and thank you for sharing!