M.E.S. Lens End Light Bulb 2.2v
Details
https://www.tts-group.co.uk/m.e.s-lens-end-light-bulb-2.2v-25pk/TB2.5L-25.htmlProduct Code: TB2.5L-25
The style of this 2.5V bulb makes it less likely to break even if dropped.
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