1600:

Smooth bezel / generic inside caseback number

1601:

Gold fluted bezel

1602: 

Toscanisée AKA moiré AKA linen bezel + case shoulders

1603: 

Engine turned stainless steel bezel

1604: 

Likely non-existent

1605:

[likely non-existent, please prove otherwise]

1606:

[likely non-existent, please prove otherwise]

1607: 

bark bezel

1608

[likely non-existent, please prove otherwise]

1609

[likely non-existent, please prove otherwise]

1610

[likely non-existent, please prove otherwise]

1611

”Decor Gay Freres 8551′ bezel

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