This is an old, hand-wound wristwatch. The dial indicates 19 jewels, but the movement is Takano cal.534, which has been replaced with a 21-jewel movement. Operation confirmed. Winding the mainspring: OK Stops when fully wound. Crown operation: No problems Time adjustment possible by pulling the crown out one step. Change the date by rotating the hands. You can change the date by moving the hour hand back and forth between 9 PM and 12 AM, but it puts a strain on the mechanism, so I don't recommend it. Accuracy has been measured with a smartphone app, but it's just a reference when laid flat. I believe this item is from the 1960s. This is from my collection. The strap is an aftermarket extension type. Fits wrists of 17cm perfectly. It stretches slightly, so it should fit up to about 20cm. Consider it a bonus. This is a rather rare item, so please refrain from price negotiations (⁠｡⁠・⁠ω⁠・⁠｡⁠)⁠ノ⁠♡