Partly because I enjoy designing my own gear ratio systems to suit my needs, I never worry about being OEM-correct with my gear tooth counts. For example, if I had a Paramount with the original 52-49 / 14-16-18-23-26 freewheel, I would not hesitate to change to 49-46 / 14-16-18-20-23-26 or 49-46 / 14-16-18-21-24-26 (my gearing on Capo #2) with an ultra-6 freewheel. I can't stand that original 18-23 gap right in my most-used gear range.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069