Hi all, I just picked up this watch and would like to see if anyone could maybe give me a rough date of when it was made and by whom? It has no makers marks that I can see, an 18k gold case with a 'metal' dust cover. It has the Swiss Helvetia hallmark stamp on the inner case cover and on the stem part of the case. I know that these were used from 1880-c1907. I know the movement could have been re-cased but I see no evidence of this (screw marks ect...). Any information would be greatly appreciated .