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The OPL is not really a suitable candidate...
Any of the others you see which say they are "prism" direct vision spectroscope can be easily dismantled to extract the Amici prism assembly. If this is then placeded behind an eyepiece you'll see the spectra from the brighter stars and be able to replicate Hartung's work.
( I started out just using a small 60 degree prism mounted in a film canister to see the stellar spectra - it works well to identify planetary nebula!)
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