Great suggestions and advice, thanks everyone. So here is the pipe:
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It is a '79 Dunhill Quaint, quaint indeed. (I've written about it elsewhere on the site.) I tried to take a photo inside the bowl...
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Not easy to see. Seems okay... But something wasn't quite right so I took the stem off to have a look...
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Looks like stained briar and no tobacco residue. No smell in there. Minute particles of brownish dust. But also something else. I had to sort of gently pry and poke and then I figure out the problem:
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It was full of heroin. I ought to have guessed that based on what I paid for the pipe. Well, problem solved.