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Richard Harmer
Bicolored stereoview matching Harmer’s patent application, it carries the Royal Warrant and London Stereoscopic Company blindstamp
1857 (ca)
Stereoview
Private collection of Paula Fleming
LL/83500
The deep colors of the shells tend to flicker when viewed in 3D rather then blend together in an iridescent affect.
Paula Richarson Fleming, July/August 2009 , "The Iridescent World of Bi-Colored Stereos", Stereo World, vol. 35, no. 1
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LuminousLint 
@LuminousLint