[emeritus]

Here's a scan of all the Osram battery bulbs that are listed in the almost-contemporaneous GEC catalogue for 1911. Most are supplied in 2V voltage increments for use with accumulators, and there is only one page of non-2V-step bulbs intended for use with dry batteries. The master index lists batteries and hand lamps, but they are in parts of the catalogue that I do not have. You would need to consult the comprehensive collection of old GEC catalogues that are held in the Bodlian Library at Oxford as part of the Marconi collection.

Re #109, I would think that it would be earlier than 1965, as my recollection (not 100% these days) was that the only white batteries I had featured the present Ever Ready logo that has smooth curves at top and bottom. Yours has the older wavy curve design. That is consistent with the observations made in #108 on the change of labelling, and would make it around 50 years old. Not bad!