Antique Pocket Watch Expert

For the past 3 years, i'v wearing my grandads pocket watch last weekend, I decided to do ……….
valued on the Antiques Road Show … Bugga me! imagine my surprise when the expert informed me that this was a hourglass af ** kin and non-precious pocket watch! No wonder the bloody stupid old Bugga had the wined up every 3 minutes ….. but I have all the interesting family heirlooms .????????
It seems that one has expired. He He!
Stella Rubin, Antique Quilt Expert, on Martha Stewart
My granddad has found what appears to be a 9ct gold wristwatch while metal detecting. He’s asked me to do some research on this for him. The wristwatch has a code on the back 842027-1328. I have taken it to my local antique shop who have told me the 375 code mean 9ct gold and the watch maybe a possible rolex and that the long number code would defiantly be traceable. Could you possibly help me out or send me in the right direction? I could provide pictures of the watch if this would help. Please contact me.
Thanks Hayley