1920's rose gold ladies Rolex - unmarked dial

[Loz]

Hi, this is my first posting - so please forgive any gaffs!

I have discovered that a small gold watch, given to me by a family member, is an old Rolex, tho its face is unmarked. I flipped off the snap on back and discovered beautifully stamped works and the back plate contains lots of clear info for research. Condition is good and the face glass is unmarked but the case is a little grubby.
The watch is working and I would like help identifying its age etc. I have googled for info and know a little about the history of Rolex, its beginnings and so on. I have attached photos and would be grateful for any information from near or far! Thanks for all informative responses!