Vintage Shimano Dura-Ace BB-7700 sealed cartridge bottom bracket.

Octalink V1 spindle with 109.5 mm length printed on the body and silver alloy cups with a black center shell.

Body markings read: DURA-ACE, BB-7700, SHIMANO JAPAN VIA, PAT. PENDING, with L and R directional arrows.

Weight on scale: 175 g.