The makers put a lot of information on the box but as the top of the box is missing we do not have the full type designation. The dome of the envelope has a clear letter F but the first letter is missing.![](../pics/aaa0910a.jpg)
The base pins are an unusual form of spring construction.![](../pics/aaa0910b.jpg)
The box makes great play of the British nature of the manufacturer.The balloon envelope is 42 mm in diameter, and excluding the B4 base pins is 90 mm tall.Reference: Observation. Type LF was first introduced in 1924. See also 1924 adverts. |
Updated April 12, 2013.
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