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Seiko 1520B Escape Wheel Jewels

RickTock
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RickTock Watch Enthusiast

RickTock

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Greetings folks,

I'm in the process of cleaning a ladies Seiko 1520B movement from the mid-70s. The jewel situation for the escape wheel is new to me so I thought I would post it here for sake of interest and discussion. On the dial side of the watch, there is what I would consider t be a 'normal' jewel for the escape wheel. However, on the watchmaker side, the jewel has a capstone and shock protection.

Screenshot2023-10-23at10_45_21AM.thumb.png.e48005464c8315e416fd39b372f52346.png

This is new to me. Are there other movements that employ shock protection on one side of a pivot but not the other?

Cheers!

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JohnR725 Distinguished Member

JohnR725

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3 hours ago, RickTock said:

watchmaker side,

in other words is visible it's there to impress you were you impressed? that's why it's not on the dial side is impossible or harder to see and nobody to impress their.

I've attached a PDF of common things and I believe this jewel is shown

in the bestfit book here's an example of escape wheels. Not unique to Seiko where you might have a end stone and then a course that changes the pivot. You might conceivably have a watch that has different jewel accounts and you can end up with different escape wheels action you have to specify when you're purchasing not in the case of the Seiko can still have a part number if you can get a parts list. But this kind of thing does lead to confusion if you're wondering escape wheel and the pivots are wrong.

image.thumb.png.c1c568a61da361c7aa7ebedfaca7cb3b.png

 

 

02. Items common to all Seiko watches.pdf

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RickTock Watch Enthusiast

RickTock

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3 hours ago, JohnR725 said:

in other words is visible it's there to impress you were you impressed? that's why it's not on the dial side is impossible or harder to see and nobody to impress their.

I've attached a PDF of common things and I believe this jewel is shown

in the bestfit book here's an example of escape wheels. Not unique to Seiko where you might have a end stone and then a course that changes the pivot. You might conceivably have a watch that has different jewel accounts and you can end up with different escape wheels action you have to specify when you're purchasing not in the case of the Seiko can still have a part number if you can get a parts list. But this kind of thing does lead to confusion if you're wondering escape wheel and the pivots are wrong.

image.thumb.png.c1c568a61da361c7aa7ebedfaca7cb3b.png

 

 

02. Items common to all Seiko watches.pdf 2.43 MB · 2 downloads

Very helpful, thank you!!

From the PDF I learned that the upper escape wheel jewel in question is a Diafix. I removed its spring and cap jewel successfully this morning. (Yay!) Was very careful as I did NOT want the spring to launch. That may be the tiniest little watch part I've handled to date. So far, this has been a fun little watch to work on.

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