  | 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". |
Bullhead Dial version
   | Seiko Brown Bullhead has 3 dial version: 1. Seiko Chronograph Automatic 2. Seiko Speed-Timer 3. Seiko 5 Sports Speed-Timer |
 | Seiko Black Bullhead has only 1 dial version: 1. Seiko Chronograph Automatic |
Dial Reference Version
 | Seiko Brown Bull head dial version "Seiko Chronograph Automatic" should come with a dial reference number "6138-0060T" and English/Spanish Day Wheel. |
 | Seiko Brown Bull head dial version "Seiko Speed-Timer" should come with a dial reference number "6138-0071T" and English/Kaji Day Wheel. |
 | Seiko Brown Bull head dial version "Seiko 5Sports Speed-Timer" should come with a dial reference number "6138-0070T" and English/Kaji Day Wheel. |
  | Seiko Black Bull head dial version "Seiko Chronograph Automatic" should come with a dial reference number "6138-0060T" and English/Kaji, English/Arabic, English/Spanish Day Wheel. |
Seiko bullhead hand
  | Hour/Minute hands Seiko Bullhead has 2 hour hand version: 1. Hour/Minute hands with luminous material. It should be found in Seiko Black and Brown bullhead dial version "Seiko Chronograph Automatic" 2. Hour/Minute hands without luminous material. It should be found in Seiko Brown bullhead dial version "Seiko Speed-Timer" and "Seiko 5Sports Speed-Timer" |
  | Hour/Minute Chronograph hands Seiko Bullhead has 2 hour hand version: 1. Hour/Minute Chronograph hands in Black It should be found in all dial version of Seiko Brown bullhead 2. Hour/Minute Chronograph hands in White It should be found in Seiko Black bullhead |
  | Sweep second chronograph hands Seiko Bullhead has 2 version of Sweep second chronograph hand: 1. Sweep second chronograph hand in Yellow. It should be found in Seiko Black and Brown bullhead dial version "Seiko Chronograph Automatic" 2. Sweep second chronograph hand in Red. It should be found in Seiko Brown bullhead dial version "Seiko Speed-Timer" and "Seiko 5Sports Speed-Timer" |
Seiko Bullhead Bezel
   | Seiko Bullhead has 3 Bezel version: 1. Brown color, "TACHYMETER" in Gold, Number in Silver, and Indexes in Gold. It should be found in Seiko Brown bullhead dial version "Seiko Chronograph Automatic" and "Seiko 5Sports Speed-Timer". 2. Brown color, "TACHYMETER" in Silver, Number in Silver, and Indexes in Silver. It should be found in Seiko Brown bullhead dial version "Seiko Speed-Timer". 3. Black color, "TACHYMETER" in Silver, Number in Silver, and Indexes in Silver. It should be found in Seiko Black bullhead dial version "Seiko Chronograph Automatic". |
