WEST END WATCH CO. SOWAR PRIMA Manual Winding Working 31.9mm This is a vintage "West End Watch Co. Sowar Prima" manual winding model. The case size is approximately 31.9mm including the crown. It is currently running, but there is no guarantee of accuracy or future operation. Please check the condition in the photos as it is a used item. I am a wholesaler of vintage watches. Please take a look at other items in my store. No claims and no returns accepted.