I'm not a watch person but I know clean and pristine when I see it.   From an estate / moving sale I found this gleaming Waltham 15 jewel open face pocket / pendant watch which I thought was new but realized it was a genuine antique mechanical pocket watch.   In the most amazing condition for it age, I gave it a wind up and it stated ticking smoothly and has keep great time since.   The 25 year warranted case shows no wear or damage.   I see no indication that it was ever on a chain or pendant.   Crystal is clear and scratch free.  Face is perfect...no cracks or discoloring.   Backs open easily and securely snap close.    Watch the video and turn up the volume!
Based on the serial number and according to the Waltham database it was produced in 1904 and is a size 0s ? (though without removing the movement I measure it as slightly smaller).     The graceful monogram on the back is just lovely in it own right.     I have not had this watch serviced, cleaned or "looked at".  It is as I found it fresh from the estate sale. 
 If you have any questions....contact me and I will do my best to answer.