If you see six then it looks as though you do indeed have an air-spaced lens. Roland has been known to produce an occasional air-spaced lens.
I would normally expect to see 4 with an air-spaced doublet, not 3, but maybe the curvature of one of the surfaces is such to make its reflection elusive.
Roland doesn't inhabit CN. He does hang out on the AP forum on Astromart, and also on the AP-UG Yahoo group. You might want to post your query to one of those places.
-------------------- Seven telescopes of a diverse nature.
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