Received by e-mail from somebody identified only as "gippeswyc":

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I found a reference to the above switches at electrical-contractor.net while researching and thought you & its members might be interested in this.

While having a floor replaced in an Edwardian house in Ipswich, I found a box for such a switch in almost pristine condition - carefully closed and undisturbed
for perhaps over 50 years. Top & bottom are pic 1 while the 4 sides are pic 2.

[Linked Image]

[Linked Image]

Thanks to gippeswyc for taking the trouble to send me these photos. It's amazing the treasures that can lie hidden away for decades.