Edison C-200 lightbulb

[VictorXIa]

I recently bought an Edison C-200 with the interior light bulb attachment. Sadly, the original bulb burnt out the other day and I would like to replace it, but I haven't the slightest idea as to what size and voltage/wattage the bulb is. All I know is that it is a bayonet style bulb with two contacts on the bottom. Does anyone know what size light bulb I need and where to get one? Thanks, Nick