Shimano RD-7100 (black), Early EX (version 2)
Main Photo
Category:  Rear Derailleurs
Name:  Shimano RD-7100 (black), Early EX (version 2)
Brand:  Shimano
Primary Group:  Dura-Ace 7100
Model:  RD-7100, DA-200
Years:  1978 - 1984
Country:  Japan
Added By: Walkman-man on 03/28/17
Updated By: ekxlme on 02/25/19
Additional Photos - click for full size
Shimano RD-7100 (black), Early EX (version 2)Shimano RD-7100 (black), Early EX (version 2)Shimano RD-7100 (black), Early EX (version 2)Shimano RD-7100 (black), Early EX (version 2)Shimano RD-7100 (black), Early EX (version 2)Shimano RD-7100 (black), Early EX (version 2)Shimano RD-7100 (black), Early EX (version 2)
 Verify Component Photos
Outer Plate MarkingsDura-AceInner Plate MarkingsShimano Ind. Co. Ltd. Japan
MaterialAluminum Alloy; SteelDesign CategoryInline parallelogram
Attachment Bolt Size6mm Allen KeyCable Attachment Bolt Size6 mm Allen Key
Shifting SystemsFrictionCable AdjusterYes
Cage LengthShortMax Cog Size26
Max Chain Wrap  
General Information
Black anodized version of the first generation Dura-Ace labeled rear derailleur.  I don't see the markings on the back arm stating that it was known as the RD-7200 when this one was produced, but this design was known as the 7100 by the early 1980's.  
Guide pulley made of plastic, instead of the 7200 model which had stainless steel upper pulley, and 7100 has shorter cage than 7200 as well.
This DA-100 variant is designed with a different jockey wheel cage (see note below). The variant actually has a sub model number (DA-200), as per a Shimano tech doc, where it's listed alongside the standard variant (DA-100) in what I think was the first doc produced after release of the model, indicating that both variants were realised simultaneously. Despite this, the DA-100 seems to be more rarely found than the other.
This model was also available in silver. 
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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 RD-7100 (black), Early EX (version 1)ShimanoDura-Ace 7100
Shimano RD-7200, Dura-Ace EXShimanoDura-Ace EX
Component Groups
Primary 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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