The Radiomir is 45 mm vs. 44 mm for the Luminor but wears smaller since it is less thick. When I wear a dress shirt for work, my Luminors don't fit under my sleeve. If I wear a Panerai at work I wear my blackseal. It is a more formal looking watch and is sort of a dress watch. The crown stripping issue is real, however. After 2 years with my blackseal, the crown stripped. It took my watchsmith 2 hours to modify a Davidsen crown to fit my River case.