Am A finishing and [confirmed internal machinery and precision]
It is published in 1953 as special sports models Explorer 1. First Ref.6150 from Ref.214270 of the current ' black dial 3.6-9 index "that basic design is the same. In 2001, Cal.3130, 2007-serial number engraved on the inside of the case. Sense of size is better off even on a convenient model can be used. Good condition with accessories is recommended.