(IAAC) Direct vision (Amici) spectroscopic prisms

Does anyone know a supplier who can sell direct vision spectroscopic prisms
otherwise known as Amici prisms.I'm looking for a source of 5 prism or 3
prism versions?
Nick Martin, Bonnyton House, By Ayr, Ayrshire KA6 7EW ,Scotland, UK.
 Latitude 55 24'56" Longitude 4 26' 00".

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