Dating campagnolo chainrings
A TIPO RONDINE decal may or may not appear on some older Olmo bikes, and refers to the Agrati AM lugs, with 'rondine' meaning 'swallow.' Some older Olmos have the ornate Agrati lugs which Emilio Bozzi sold as Brianza sportiva lugs; the accompanying Agrati rear dropouts are stamped with a scalloped back.However a few Olmos with Brianza lugs have Rondine decals, so go figure. Dating bikes by bike parts is not an exact science since dated parts could be used into following year(s).
Think I still have these hubs, again I could mis-remember, but think they had CAM 58 on the lock nuts. Cant recall the pedals." DECALS: OLMO in Red Oblong Outline on downtube, edged in bands; On seat tube, there are bands but is missing the Olmo shield; MADE IN ITALY at top of seat tube; TIPO RONDINE at top of downtube; Olympic rings with Olmo star decal at top of fork legs Serial Number D312 1958? Owner: "My uncle says he bought it in the late 50s...Olmo Professional Roger Barrett: Swallow rondine lugs with seat lug side slot; "Complete machine, nearly all original. Campagnolo 1010 dropouts." [don't know if lugs and fork are chrome, as in Professional Deluxe model, re: 1961 catalog] ORIGINAL PARTS: "Ambrosio Champion steel stem and Ambrosio Champion alloy bar. Campagnolo Record seat pillar" Serial Number C771 1958?Olmo Professional romag.loren/e Bay: Swallow rondine lugs with no seat lug side slot; Campagnolo horizontal dropouts; chrome section on top tube; chrome stay ends; chrome fork ends; chrome bands on seat tube ORIGINAL PARTS: Campagnolo Gran Sport derailleurs (rear with cable adjuster), Open C Campagnolo shifters, Mafac brakes, Campagnolo hubs, Magistroni crankset, Campagnolo pedals, Brooks Campagnolo narrow rails saddle, Campagnolo seatpost, Ambrosio Champion handlebars, Ava stem, Campagnolo headset, Magistroni seat post clamp REPAINTED Serial Number C779 1958?DECALS: no decals; painted blue DATING: Owner: "Sport model, 1889 on the seat tube and 17 under the bottom bracket" Serial Number 1982 1950s? ] art-bikes/e Bay: Swallow rondine lugs with no seat lug side slots; Headbadge is Olmo 'Lazy L' star logo; stamped steel dropouts; crimped on underside of chain stays from kickstand -- perhaps originally a city bike; bare frame Serial Number UT 6275 1945 Olmo [city bike, Industria Argentina] German via coventryeagle48/Flickr: Swallow rondine lugs with no seat lug side slots; chrome head lugs, fork crown, fork ends, stay ends and dropouts DECALS: Olmo in script on downtube; "Industria Argentina" under Olympic rings at top of downtube; "Campionato Italiano Diletta Iti 1942/43" on seat tube; Olympic rings with Olmo star decal at top of fork legs, and also at transition between paint and chrome on fork legs; OLMO oval on seat tube Serial Number A327 Late 1950s?
Olmo Dario Cattaneo: Swallow rondine lugs with no seat lug side slots; Campagnolo dropouts; chrome head lugs, fork crown, and rear dropout ORIGINAL PARTS: Campagnolo Gran Sport derailleurs and shifters; Magistroni three pin crankset DECALS: Head tube decal with Olmo 'Lazy L' star logo; Olmo Celle L chainguard decal on down tube; Olympic rings with Olmo star decal on seat tube DATING: The Campagnolo Gran Sport rear derailleur lost its cable housing adjuster screw around 1960. Olmo Professional pepperbelly/bikeforums.net: Swallow rondine lugs with seat lug side slot; open C Campagnolo dropouts; chrome head and seat lugs; chrome stay ends; chrome fork ORIGINAL PARTS: Olmo headset REPAINTED DATING: Open C Campagnolo dropouts date to the 1950s. Olmo city bike cicli2d/e Bay: Swallow rondine lugs with no seat lug side slot; internal routing of top tube brake cable; Agrati dropouts; chrome head lugs, fork crown, stay ends and dropouts ORIGINAL PARTS: Olmo city handlebars; Olmo seat post collar; Olmo crankarms; Universal brakes Serial Number C505 1958?Campagnolo crank arms have a date code starting in 1973, consisting of a diamond (1970's) or circle (1980's) with a number in the center denoting the last digit of the year of manufacture, and then in 1985-9 with square and number in the center: 11 = 1985, 21 = 1986, 31 = 1987, 41 = 1988, 51 = 1989 plus some other examples. Olmo Rondine Aldo Ross: Swallow rondine lugs with seat lug side slot; chrome head lugs and fork crown; chrome stay ends; Campagnolo Cambio Corsa dropouts and fork ends ORIGINAL PARTS: "Cinelli steel stem, Cinelli aluminum bars, Weinmann brake levers (later), "Balilla - Olmo" brake calipers, ...