How to treat Omega's old models with watches?

Each omega watch model is 8 digits (XXXX. XX.XX):

Similar to ABCD. EF. G H:

The first number a indicates the product line:

Character product series

1 constellation series

2 hippocampus series

3 Motorized Altman Series

4 Butterfly Princess Elegance Series

5 Butterfly Flying tourbillon Series

7 Butterfly Series

1 = constellation series

2=Seamaster hippocampus series

3 = Suba Motorized Altman Series

4 = Deville (prestige and symbol of Deville) Disc Flying Elegant Series

5 = Deville Tourbillion's Dish Flying tourbillon Series.

7=DeVille (Vasarelli) Disc Flying Series

The second number b represents the watch material:

Character material

1 All-gold case and bracelet

2 gold case bracelets

3 gold case, partial gold bracelet.

4 gold case, fine steel bracelet

5 steel case strap

6 gold case, leather strap

7 gold case and leather strap

8 fine steel case, leather strap

The third and fourth radical product series are related:

A, the third number c represents the size/movement:

Character movement type

0 coaxial motion

1 automatic mechanical or automatic timing movement

Automatic mechanical waterproof movement or automatic mechanical Greenwich movement.

4 timely waterproof campaign

Automatic mechanical waterproof movement for daily life

6 waterproof exercise in daily life.

7 women's sports watches

8 women's quartz watches

9 fully automatic mechanical multifunctional chronograph movement

B, the fourth number d represents the bezel type.

Character border type

1 The blue bezel is made of gold or steel or professional diving titanium alloy.

Bright steel, gold, blue or platinum.

3 bright steel, or titanium alloy diving

Black, all steel or gold.

Blue, steel or steel diving

6 gold or titanium alloy

Fine steel chronograph, or GMT, or gold chronograph.

Blue steel chronograph

The fifth number e indicates the dial color:

1 = champagne color

2 = white white

3 = Silver Silver

4 = gray gray

5 = Black Black

6 = Ivory Ivory

8 = blue blue

The sixth number f represents the hour mark on the dial:

0 = Mixed (luminous number and Arabic number)

1 = index (scale indication)

2 = Arabic (Arabic numerals)

3 = Rome (Roman numerals)

5 = diamonds

The seventh and eighth digits GH indicate the color of the strap:

1 = black.

2 = Brown

3 = blue

4 = Green