The case should be polished with Mirror & Matt Finishing in the position as same as the picture. Especially, It should have be sharp edge finishing.
The button and the pusher should look as same as the picture.
The case back should be stamp with a reference number "6138-0040" or "6138-0049". Only Seiko Brown bullhead dial version "Seiko Chronograph Automatic" that has a case back reference number "6138-0049".