Shimano M-140 / MA-100, Dura-Ace First Gen.
Main Photo
Category:  Brake Levers
Name:  Shimano M-140 / MA-100, Dura-Ace First Gen.
Brand:  Shimano
Primary Group:  Dura-Ace
Model:  M-140 / MA-100
Years:  1973 - 1976
Country:  Japan
Weight:  212 grams (Actual),
New Pair with hoods
Added By: JFischer on 07/19/07
Updated By: Bill Kloos on 02/09/11
Additional Photos - click for full size
Shimano M-140 / MA-100, Dura-Ace First Gen.Shimano M-140 / MA-100, Dura-Ace First Gen.Shimano M-140 / MA-100, Dura-Ace First Gen.Shimano M-140 / MA-100, Dura-Ace First Gen.Shimano M-140 / MA-100, Dura-Ace First Gen.
StyleNon-AeroReturn Spring No
Quick Release NoCable AdjusterNo
Lever Material AluminumLever MarkingsShimano Dura-Ace drilled levers.
Body Material AluminumHood/Body MarkingsShimano with Logo
Attachment Bolt AccessBehind lever, no access hole  
General Information

First Generation Dura-Ace.  I've seen weights ranging from 150g (catalog) to 209 for a pair of these.  I personally think the 209 value as it came from an actual person who weighed a pair recently. Produced at least up till 1976.  In 1977 the original Dura-Ace group was re-released as the 7100 series group with the first Dura-Ace rear derilleur which replaced the Crane rear derailleur introduced in 73.

73 / 74 these levers were labled as model M-140, in 75 they were labled as model number MA-100.

I am posting three photos of a new pair with hoods, weighed at 209g.  I am also posting in a separete listing photos of a new pair of identical levers, but for the marking on the blades, which are not perforated and say simply "Shimano." 

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Additional Resources
Resources:Reference & ChartsCatalogs
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 3)BrandGroup
Shimano Dura-Ace First Gen with Extention LeverShimanoDura-Ace
Shimano Dura-Ace First Gen. (black)ShimanoDura-Ace
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Dura-Ace, First GenerationShimano1973 - 1976, Road RaceView 35 Components
Details:   The introduction of Dura-Ace in the mid 1970's, along with the indroduction of the Shimano 600 group were Shimano's first attempts at a professional quality road racing component group.  The first Generation Dura-Ace was updated and renamed the 7100 series by around 1977/78.
Group NameBrandQuick InfoBrowse Group Components
Dura-Ace 7100Shimano1977 - 1984, Road RaceView 18 Components
Brand Information(click to expand)

Shimano Model Number Prefix List:

BB Bottom Bracket BL Brake Lever BR BRake
CB Coaster Brake CJ Cassette Joint CN ChaiN
CP Chain Protecto CR Chain Ring CS Cassette Sprockets
DF chain DeFlector DH Dynamo Hub FC Front Crank
FD Front Derailleur FE Fork Ends FH FreeHub
FS Front Suspension HB HuB HD HanDle bar
HP Head Parts (Head Set) HS Handle Stem IF Inter-3 Freehub
LP LamP MF Multi Freewheel PD PeDal
RD Rear Derailleur RH Rollerbrake Hub RM RiM
RR ReflectoRs RS Rear Suspension SB Shift Brake lever (Nexus, ?)
SC Speed Calculator (cycle computer) SF Single Freewheel Freilaufritzel SG Speed chanGe hub
SH SHoes SL Shift Lever Schalthebel SM SMall parts
SP Seat Post SQ Seat Quick release SS Single Sprocket
TL TooL WH WHeel ST Shift Brake Lever (STI, Rapid Fire, etc)
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