first post: recently got this 70s seamaster, movement looks good but some things about it are making me nervous of its authenticity. any help or information would be great. things that are raising my suspicions are -the crown seems different to many of the others I've seen (although I've seen one with the same crown) -dosent have seamaster on the dial -havent seen any others with the same patterned dial -the case back looks slightly different to many others I've seen i feel as if maybe the face is a replacement but any if info would be great tia