When I am really interested in a bike, I respond with "I'm interested, I have cash and I will come over at your convenience".
That usually gets some attention from the seller.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group