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Lorus Quartz Movement Help


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my neighbor asked me if i could put a new battery in her lorus nurses fob watch , but unfortunately it still doesn't go with the new battery fitted.

I had a look on Cousins just to see how much a new movement would be but got a bit bogged down by the amount available and ligne size and all that.

As i say its a lorus fob the writing on the movement says Japan and the numbers are PH3N P021J any help as to how to find the replacement most appreciated as my search on Cousins drew a blank 

thanks Andy

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From Esslinger:

 

Outside Diameter: 6 3/4 x 8 Ligne or 15.3 x 17.8 mm
• Movement 3.15 mm thick
• The height from the bottom of the watch movement to the top of the sweep second pinion is 4.80 mm
• 3 Hands
• Requires watch cell 377
• Requires watch hands: hour 1.20, minute .70, and sweep second .17 mm
• Has NO jewels
• Stem: 354222, Tap 10
• Overall height from the bottom of the movement to the top of the sweep second pinion is 4.82 mm
• Includes watch stem and temporary plastic watch crown
• Hattori Japan quartz movement
• Japanese assembled

 

US$4.95 and the stem and battery are included!

 

They list 3 versions: PC21, PC21HCP, and PC21XHCP. The difference is the overall height...so make sure you get the correct one. Corresponding prices increase by one dollar.
 

Edited by bobm12
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The manufacturer lists four versions: PC21AE, PC21AF, PC21J & PC21S

 

The difference is in the height of the sweep second pinion. Except for J & S, which are the same height. I think the difference between J & S is that J has a longer battery life. (3 years vs 2 years.)

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    • Personally I would just replace like for like.Or just polish the old crystal and refit.
    • I've also heard it called the "top side" and the dial side the "bottom side", which should make any non-repairer very confused. There are many examples and sometimes it comes down to personal preference. Personally, I like to say "dial train" whereas most other people would use the term "motion works".
    • Is magnetism such a major problem that we (as home hobbyists) need to spend $$$ on a fancy demagnetiser? I use one of the cheap blue Chinese demagnetisers (£10 from ebay). It works, and has never failed to demagnetise a movement, or my screwdrivers. Magnetometer - who needs one?  Take a very small screw. If it sticks to the clean part, it is magnetised 🤣
    • My overall preference is to use traditional names and terms, that became my habit when i was taught joinery by old boy chippies 2 generations older than me , that had their time in the 40's. But what i often do is adjust the names and terms i use according to who I'm talking with. Sometimes i will say trainside and occasionally watchmaker's side. I try to find a balance between accommodating other folk ( there's no point speaking a foreign language to someone who doesn't understand it ) and using a name that appears to me to be more relevant as to its use or description. But using the name lever can be quite confusing,  some watches might have parts that are also levers, release levers, which in effect is what the pallet fork is, an escapement release lever. 
    • Then put the case number in here https://www.cousinsuk.com/category/filter/search-seiko-case-parts and it should give you the crown 
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