Invicta diver NH35A

[Joshua]

Hey, so I have a question. I've got an Invicta dive watch with a NH35A movement here that whenever I unthread the stem and crown as it is unthreading the date starts changing. Once its unthreaded I can change it to the 1, 2 and 3 positions and set and wind it accordingly. How can I fix this and what is causing this? 

 

Yours truly, Josh

[jdm]

That is a comon problem when the spring in the crown is a bit too weak, the stem is a bit too short or the inner portion of the stem somehow grips to the crown. If it is a new watch ask for a refund or replacement, otherwise a new crown and / or stem should be refitted by a watch repairer, unless he can find a way around the above issues. 

Edited August 23, 2019 by jdm

[yankeedog]

agreed , stem, If the watch has been in service for a while there could be some corrosion or dirt in the crown mechanism removing the stem and crown assembly and soaking it in some sort of penetrating oil might free it up.  a new crown gasket would be a good idea as the problem may have something to do with water or sweat  ingress.