[seikochrono]

Seiko 14094 M44 Selfdater, Need help please guys, need the crystal part number for this model, Need it for another forum member. Thanks in advance Stefan

 

[TheWatchBloke]

It's 340W03AN Stefan

 

[andrew]

Can I ask how it was determined in pre-8-digits-reference-system and in what year current system was introduced?

 

[seikochrono]

It's 340W03AN Stefan

ThankQ sir, Its for Andrew, hence the ??

 

[TheWatchBloke]

Can I ask how it was determined in pre-8-digits-reference-system and in what year current system was introduced?

It was determined by the model number. The 8 digit system was introduced in 1964 but the old didn't completely disappear until 1965. Here's the page in my casing book I got the information from.

 

[andrew]

Thanks a lot for scanning and sharing.
Very valuable information.
Such casing books from 60's are not so easily available.
Thank you.