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That's an E27 base and I'd be take a guess it's 3V rated. Something like this:
https://www.amazon.co.uk/Replacement-Customized-MJ-Premier-Operated/dp/B08JFZRJCF/Or this:
https://www.amazon.co.uk/WELSUN-Edison-Equivalent-Outdoor-Lights/dp/B09DFGQBYC/(The glass shape is called ST64 if you want to keep searching for an exact match)
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Funny, I just bought a pair of those (or strikingly similar) from energylightbulbs.co.uk
https://energylightbulbs.co.uk/led-light-bulbs/vintage-leds/vintage-leds-e27/retro-vintage-led-4w-squirrel-cage-edison-style-filament-bulb-smoked-gold-glass-st58-e27-edison-screw
Is this a standard light bulb for which I can buy a replacement? The only marking I can see on it is W.20.III
It comes from a 'Salcombe' solar powered light from TheSolarCentre. They are being very weird with questions about it - saying that it is not available in shops, that they will be selling a replacement 'soon' (although they have been saying this for literally 5 years), and that sourcing a replacement elsewhere won't work and will break the light. Well the light is no use to me without a working bulb anyway, and I don't believe any of what they're saying.
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