'Longines' gold watch face with strap missing

'Longines' gold watch face with strap missing.  Engraved on the reverse with "To mark 41 years service Mr G. Hamilton 14th April 1959 with the British Petroleum Group". he watch was presented to George Hamilton, grandfather of the donor, who started his working life as a blacksmith and then moved on to work in the shale industry.  He worked in Addiewell, Westwood and possibly Burngrange.  He then moved on to Pumpherston Oil Works and received this watch when he left BP.