These are Exciter Armatures rated for 1400 RPM (28) - Short Hood, 1450 RPM (27) - Long Hood, and 1550 RPM (26) - Black Face & Red Face. There is a
Lincoln Welder Sa-200 Exciter End Tune Kit T6968 Brush Insulators
Lincoln Welder SA200, SA250, SA300 Armature Rewind
Lincoln Welder Sa-200 Replacement Exciter Brushes T-6968 Shorthood
Vintage Lincoln Welders
DC Exciter Fields Coils – Stumpf Welding Supplies
Papers Past, Parliamentary Papers
Testing Lincoln SA200 Armature
Questions about the SA-200's - Miller Welding Discussion Forums
BW Parts
Sa-200 exciter dome cover lincoln Welder
WeldingWeb - Welding Community for pros and enthusiasts
Exciter Armature Removal on Lincoln SA-200 Kick Back and
Exciter Armature Removal on Lincoln SA-200 Kick Back and