I have been trying to do a bit of research into the above Ingersoll ladies watch. I see the gold case has the Birmingham hallmark date of 1965. I am just wondering how common a 17 jewel lever Ingersoll is? My research shows Ingersoll tended to cater for the cheaper market, with a lot of reference to pin lever/ 5 jewel lever / 7 jewel lever or 10 jewel lever Ingersoll pieces, but I can't find much reference to 17 jewel. Am I just not researching in the right place? Your knowledge is much appreciated.