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Discussion Starter · #1 ·
Hello, everyone!

I bought a vintage "diver" for the aesthetics and was curious if anyone can help me with more information about the watch.

It says "Seawatch" on the dial and "Swiss SIC 21" on the movement.

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Thank you in advance.
 

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Discussion Starter · #3 ·
Looks like an EB (Ebauches Bettlach) 8027 pin lever movement. According to Mikrolisk, Seawatch watches were manufactured by Bermi Watch.
Thank you so much!

Can you estimate what year? There is no engraving on the caseback with serial number or anything, just a generic diver swimming.

I researched a little and it seems the models were also rebranded as "Sicura", "Eastman", "Lucerne", "Spartan Seawatch", "Bifora", "Birnbaum", "Bercona" and "Austa". They are from 60s and 70s and seemed to have Swiss pin lever movements for what I found. Do you know anything about this? Just curious, I would love to have more background information.

Thank you again for the information, I'm Googling about the EB 8027 right know.
 

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Discussion Starter · #5 ·
In case you haven't found anything yet, it belongs to this general movement family:

bidfun-db Archiv: Uhrwerke: EB 8020

The one in the link may be smaller than yours (ca. 23mm across - the movement, not the watch! - rather than 25.6mm).

Hartmut Richter
Thank you, Hartmut!

I'm collecting some information I found, not much specific but pretty interesting. I don't understand much of types of watch movements, would you recommend any site or video for a curious person who wants to know more about it?

Thanks.
 

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What do you want to know? If you are looking for examples of different watch movements, you could hardly do better than Roland Ranfft's page. For the cheaper versions, Christoph Lorenz also has quite a few:

bidfun-db Archiv: Uhrwerke

Das Metatechnische Kabinett - Uhrwerke

As for explanations of how a movement works, I know of nothing on the internet (though I'm sure there are heaps of sites) - I always got my knowledge in that department out of books. If you want to scour the world wide wait yourself, try Auntie Google plus some of the following terms for the technical construction:

Swiss Lever Escapement
Pin Lever Escapement
Cylindre Escapement
Lepine Movement
Savonette Movement
Keyless Works
Automatic Winding
Column Wheel vs. Cam [or Lever] System (in Chronographs)

...plus perhaps these for what's important in watches:

Isochronism
Knocking the Banking (this is actually something to avoid!)
Positional Errors
Daily Rate
Deviation in Daily Rate
Chronometre (SOCS) Testing

...and probably many more. Have fun!

Hartmut Richter
 

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Discussion Starter · #7 ·
What do you want to know? If you are looking for examples of different watch movements, you could hardly do better than Roland Ranfft's page. For the cheaper versions, Christoph Lorenz also has quite a few:

bidfun-db Archiv: Uhrwerke

Das Metatechnische Kabinett - Uhrwerke

As for explanations of how a movement works, I know of nothing on the internet (though I'm sure there are heaps of sites) - I always got my knowledge in that department out of books. If you want to scour the world wide wait yourself, try Auntie Google plus some of the following terms for the technical construction:

Swiss Lever Escapement
Pin Lever Escapement
Cylindre Escapement
Lepine Movement
Savonette Movement
Keyless Works
Automatic Winding
Column Wheel vs. Cam [or Lever] System (in Chronographs)

...plus perhaps these for what's important in watches:

Isochronism
Knocking the Banking (this is actually something to avoid!)
Positional Errors
Daily Rate
Deviation in Daily Rate
Chronometre (SOCS) Testing

...and probably many more. Have fun!

Hartmut Richter
This is perfect, Hartmut! I didn't know where to start, now I have some direction. I'll start with the with the basic technical constructions, this will indeed be fun. Thanks again!!! ;-)
 
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