Joined: Oct 2011
Posts: 625
Likes: 45
From: Youngstown, OH
Bikes: '63 Schwinn American, '64 DL-1, '65 Schwinn Racer, '73 Super Course, '83 Voyageur SP, '89 Miyata 914, '03 EZ-1, '13 Raleigh i8 Folder
Tough to tell but seconding that it does definitely look like a Shimano, Sturmey Archers had smaller/finer threading than what that looks like. If you have any independent LBS's that have been around forever they'd probably have one. You do also need that bell crank pictured above if there isn't one already on there.
They come in a million different lengths of cable and lengths of housing, make sure you measure and order the right size.