The hobb has a 1-1/4" keyed bore.  The second picture shows the markings on the hobb.  The third picture shows a broken tooth.  This tooth should not effect the operation of the hobb.  Other than the one broken tooth the hobb is in good condition.  Markings on the hobb are as follows:

TMS
..2992 C.P.
T.T 1685
ADD. .0883
HELIX 2 deg. 11 min.