What is serial dating

Olmo Gran Sport Miguel//bikemig/bikeforums.net: Swallow rondine lugs with no seat lug side slot; forged Campagnolo dropouts; chrome head lugs, fork crown, stay and fork ends, and seat tube panel; Falck tubing PARTS: Magistroni steel crankset with alloy 49-46 chainrings; Ambrosio Champion stem and handlebars; Olmo headset and seatpost collar; Weinmann Vainqueur 999 'engraved' centerpull brakes with single spring; Campagnolo shifters, Gran Sport front and rear derailleur with cable adjuster; Campagnolo Record high flange hubs; Regina freewheel (14-26); Sheffield Sprint pedals; saddle not original DECALS: OLMO GRAN SPORT on downtube, with OLMO in white letters; CAMBIO CAMPAGNOLO winged wheel at top of seat tube DATING: Campagnolo hub locknuts are (19)60; Weinmann Vainqueur 999 center pull brakes changed from one spring to two springs in December 1962, according to Weinmann catalogs; Campagnolo Gran Sport rear derailleur lost its cable adjuster around 1960. Olmo Ron Titensor/CR: May not have swallow rondine lugs in spite of decal ORIGINAL PARTS: "...completely originalincluding fenders, steel stamped Olmo hubs w/ wingnuts, steel stem and bars, steel Magistroni 49/47 crank set.

First generation Campagnolo alloy cotterless crank with dust caps on the back side of the pedal threading, was produced in 1958, and then the crankarms changed in 1959 to longer threads and no caps; Looks like it has the Campagnolo Gran Sport rear derailleur. Olmo city bike pasqi.it2014/e Bay: Swallow rondine lugs with no seat lug side slot; chrome head lugs and fork crown; Agrati stamped dropouts with scalloped backs; pump peg behind seat tube ORIGINAL PARTS: looks all original including Olmo headset and seat post clamp DECALS: probably TIPO RONDINE at top of down tube; V under Olympic rings on each side of forks under the fork crown; On seat tube, Olympic ring color bands with Olmo decal like the Olmo head badge; downtube decal looks like the Olmo head badge; on chainguard, OLMO on white oblong background with red outline Serial Number E106 1960-1961?) REPAINTED DATING: Probably the Special model due to stamped dropouts.Bike has single-spring anodized Weinmann Vainqueur Deluxe centerpull brakes which may not be original but the single-spring style ceased production in 1962 Serial Number E36 1960?NOT ORIGINAL DECALS: head tube and seat tube decals are Olmo 'Lazy L' star logo.OLMO with red background on left side of top tube is unfamiliar on other Olmos.

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