Dating ru has an english version
DECALS: no visible OLMO downtube decals; TIPO RONDINE; Olympic rings with Olmo star decal at top of fork legs; OLMO shield over red diamonds on gold background with color band edges on seat tube DATING: Probably the PROFESSIONAL DELUXE model.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?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.Cannot see Serial Number 1947 Olmo Rondine Swallow rondine lugs with seat lug side slot; chrome head lugs and fork crown; chrome stay and fork ends; Campagnolo Cambio Corsa dropouts and fork ends Serial Number M115 1948?Olmo [Gran Sport / Professional Regular] Roger Barrett: Swallow rondine lugs with no seat lug side slot."frame with finish kaput, no transfers, Agrati "AM" lugset, Campagnolo 1010 ends, semi-sloping crown w/horizontal groove in outer side and reinforcement tangs. Ambrosio Champion steel stem and Ambrosio Champion alloy bar.This Olmo Serial Number Dating Registry records Olmos with original dated bike parts or provenance, and sometimes only with decals, in order to attempt correlating an Olmo serial number to a year or year range. Absence of a question mark means there is some certainty about a bike's year or a range of years, established by parts dating, provenance, etc., or by preceding or following dated bikes.Later Olmos with date-able elements are actively added, as well as pre-1978 Olmos. 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.
Google Books Swallow rondine lugs with seat lug side slot; chrome head lugs and fork crown; chrome stay and fork ends; Campagnolo Cambio Corsa dropouts and fork ends BRAZE-ONS: top tube brake cable ORIGINAL PARTS: 4 speed Campagnolo Cambio Corsa; Campagnolo hubs; Nisi 36 hole rims; Magistroni Senior five pin crankset with 48t chainring; Olmo headset; Brooks B17 saddle; Balilla brakes; Silver blue paint DECALS: decal remnant on top of seat tube; otherwise, none DATING: book author says bike is 1948, from an Olmo team mechanic Serial Number 889 1946-1951? ] bg.legendary.bikes/e Bay: may not be an Olmo; seller does not say it is an Olmo in the listing and description; does not have swallow rondine lugs; chrome forks; Campagnolo Cambio Corsa dropouts and fork ends REPAINTED...
Olmo [Professional Deluxe] Rydor Bike Shop: Swallow rondine lugs with no seat lug side slot; chrome head lugs, seatlug and bottom bracket; chrome forks; chrome panel on seat tube; red chromovelato BRAZE-ONS: top tube brake cable ORIGINAL PARTS: "first generation Campagnolo alloy cotterless crank set ...
Campagnolo bar end shifters, high flange hubs, steel derailleurs and a TTT alloy adjustable stem." Mafac Racer 'Dural Forge' brakeset.
Numeric serial numbers were used from the late 1970s, and then discontinued. Serial numbers are stamped on the seat lug on older bikes, or on the bottom bracket underside on later bikes (sometimes matched by a serial number on the fork steerer tube). after the year of an Olmo in this Registry designates uncertainty about its year or range of years.
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).