I am very inexperienced in seeing redials and things of the sort is this authentic?https://www.ebay.com/itm/191925876638Purchases made through these links may earn this site a commission from the eBay Partner Network

 

Not enough to tell.

One rule for a new guy to stick to is always look at the movement, bit like buying a car it's under the hood that runs it

 

Doesn't appear to be a redial. This is a small watch, better suited these days for women, and the cases of these models are not water resistant, hence you see moisture damage on the dial.

 

I don't mind size, but here is a question I have had for awhile is there any function in a sunk in crown?

 

Not essentially, unless the crown is a screw-in crown. The recessed crowns on Dynamics and 168.004 Constellations are there for aesthetic purposes.