De Ville second sweep hand query

Hi there I have three Omega watches, among a variety of others. My name's Mel, I've lurked around this forum for a while and now have become a member.
I have an elderly De Ville automatic, day & date. (looks to be Seventies), that I use quite a bit, it took me a while to figure out how to set the date. I now know, thanks to searching this forum, that it's done by pulling and pushing (pumping) the winding crown, something I've never seen before but works well once you know about it.
My reason for this query is to find out if the centre sweep hand on this model is stoppable, nothing I do when setting the time will stop it. The only marking I can see on the back (non removable) is Tool 106.
I'll put up a photo if it helps as I'd be happy to hear from anyone who can give me any other information about this model.
Thank you, Mel.
UPDATE
I've now added a Photo, and would be pleased to have any information, date? model number? on this model, or the Constellation that's shown with it (it does have a stoppable seconds hand).

Thanks for the prompt reply, I've stopped all of the annihilation ambitions since I retired so I can live with that.

Can I assume that Tool 106 refers to a device used to remove the movement from the front of the watch?
Mel.

Thanks again, Mel.