Help! Too confused...

[topcat28]

Firstly, hello! This is my first post, so please be gentle. And I'll apologise now if I ramble...

I've been lurking for a while, and learnt a lot. But not, it transpires, enough!

I've been looking today at a potential purchase for my girlfriend. Its from a 'reputable' jewellers, but not one that specialises in high end watches. It doesn't have paperwork or boxes, but seems to be in excellent condition. It has apparently been serviced recently, they will show me the paperwork. It will come with a 2 year warranty - that I'm happy will be honoured.

So, what (I think) I know: Its a 'mid size' (I assume) 29mm (29.9mm?) steel Oyster. It has an Oyster strap which seems to be in good condition, and an off-white (silver?) face. From memory I can't remember if its a rivet strap - I think not.

Its face is marked ROLEX OYSTERDATE and PRECISION, with T Swiss T at the bottom.

What confuses me, is that it is self winding. Everything I have read says that OYSTERDATES are not.

So, confused.com. Sadly I didn't have my phone with me to take a picture, which the chap even suggested.

One thing occurs to me - it's not self winding, and the jeweller is wrong! It certainly started working on movement, but could a manual watch find a last little bit of energy if agitated?!

Thank you for getting this far! Any clarity would be much appreciated...