Shimano Dura Ace  EX  ( 7200 ) -  5 / 6 Speed chainring ( Anodised Silver Finish ).

45 Tooth  inner..

Road  PCD - 130 mm..

Formed Part of Original  Shimano Dura Ace  EX 7200 Series Group  - Circa 1978..

PLEASE NOTE - Supplied in Plain Pkg. ( Not Branded packaging )...