23 makers starting with “O”
ODO (3)
OG Clock Co (2)
OJR (1)
Oldfield (1)
Oliver, Daniel (1)
Oliver, John (1)
Olsen, Chris (1)
Omega Watch Co (2)
One Hand Clock Co (14)
OOIE (1)
Oppenheim, W (1)
Orange (2)
Ortner, RP (1)
Orton, Preston and Co (1)
Osborne, Shelden (1)
Ostlerreich-Ungran (1)
Oswald Uhrenfabrik (77)
Oudin, Chs (4)
Ourry (2)
Outdoor Supply Co (1)
Owen and Clark (2)
Owens, George B (17)
Owens, Owen (1)