New to automatic watches

greetings.

I’m fairly new to the forum and just got back into mechanical watches. I have had a vintage Longines from the 50’s that was beautifully made but I got rid of it because it was small at 28mm. It looked more like a ladies watch. It kept very accurate time however.

Wanting to get a more modern version I purchased

a Used LIV automatic with a Sellita SW100-1 movement. I read a lot about this movement and concluded it would a solid workhorse with a great reliability record. From what I read these are accurate from +-5-30 seconds per day.

Unfortunately I’m getting nowhere near this and recently noticed that mine is off by 15 minutes in less than a week. I’ve never had a self winding watch so I’m wondering does this need to be moved back and forth for a period of time each day or should normal wearing time and activity be enough to keep it running.

Seems to me 15 minutes slow within less than a week is abysmal..

Thanks for the response Dan. I will try your suggestions and report back. I guess I didn't realize I needed to hadwind this watch. I gave it a good winding and we'll see.

Thank you again.

Yeah, I think you are right about service being needed.

I did as Dan said and it's already 1 minute and 15 seconds off today from winding and setting it to the second yesterday. Completely unacceptable in my view.

So something is amiss.