An early 20th century Edwardian clear glass and silver plated jam pot with a spoon and swing handle opening mechanism and a star cut base. Marked on the inside of the lid: 
Goldsmiths & Silversmiths Company, 112 Regent Street W1 | Regent Plate | Patent No. 551 | Registration No. 56384

English, circa 1910
 
Dimensions

Height: 9cm / 3½"
Height (top of handle): 14cm / 5½"
Diameter (of base): 7cm / 2¾"
Length of spoon: 15.5cm / 6”