I recently acquired a Stowa Flieger Classic 40mm from a fellow WUS member, and have a question regarding the movement. This is a handwinder with an ETA 2804 inside. The watch has a regulator "tail" for adjustment, but I note most technical drawings and photos of the movement, including the ETA website, show a regulator adjustment screw. The watch is fairly new, being sold in early 2018. I was wondering if there was a point that ETA switched over the the screw type adjuster or if it is a result of a different grade of movement.