This was the UK theatre's first diecast spotlight, launched in 1953 and only superceded in 1983, by which time it had made friends all over the world for Strand. Neat, strong, adaptable (see the 23N on this display), the Strand Pattern 23 was good enough to be the backbone of small theatre spotlighting and a winning problem solver in large theatres where space was tight. Many examples find a second life via online auctions as collectors items.
This cutaway formed part of a memorable foyer display at Strand Electric HQ, King Street, London, circa 1965

Photo: Cutaway Patt.23 (September 2014)
From Jim Laws Collection
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Photo: Cutaway Patt.23 (September 2014)
From Jim Laws Collection
Click thumbnail to enlarge

Photo: Cutaway Patt.23 on display for Strand 100th Anniversary at PLASA 5 October 2014 (October 2014)
From Jim Laws Collection
Click thumbnail to enlarge

Photo: Cutaway Patt.23 on display for Strand 100th Anniversary at PLASA 5 October 2014 (October 2014)
From Jim Laws Collection
Click thumbnail to enlarge