OBS 60s 0.1s Mechanical Stopwatch Chronograph Physics Teaching Aid Lab Instrument

It has arrived with the box a little dented, the chronometer was protected but I the flexible and malleable band like plastic bags, in addition to putting it with a few turns, I would have held the 2 open ends with adhesive tape for packaging, the chronometer appears to be fine but I have wound the key and the winding is at the end and it does not make any movement, I have pressed each button repeatedly and nothing works, I have shaken it a bit because sometimes manual winding mechanisms work with a small shaken , soon I will upload the photographs , it has worked 2 times in a row , I will continue testing and I will comment more when uploading the photographs , you need to fully press the buttons , the starting button makes a click .

In working condition, works. The only thing is, the top button is hard enough to press.