24v 3w pygmy bulb with an E10 miniature screw cap (MES). This type of bulb is used in Christmas decorations, torches, appliances, and as a panel lamp to light switches etc. With Christmas decorations, especially older ones the screw thread on the bulb could be an E5, E10, E12, E14, E17. Before ordering, check the following details: Voltage of the bulb - commonly 24v or 240v (mains), Wattage of the bulb - often somewhere between 3w and 15w, Screw thread size - measure carefully, 2mm makes all the difference between E12 and E14!.
