Seiko Crystal 330W18GN00 Plastic/Mineral? - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 08-10-2019, 07:24 PM   #1 (permalink)
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Default Seiko Crystal 330W18GN00 Plastic/Mineral?

I purchased what I thought was original Seiko Hardlex watch crystal, part no 330W18GN00 on eBay. I took it to my watchmaker today and he said it's not original within 2 seconds of feeling and looking at it and told me it is plastic.

The crystal I purchased came in the package as attached, with "Hattori Seiko Co., Ltd" on it. Is this packaging original from Seiko? I have purchased the same NOS crystal before but it came in a different packet with Kanji and a faded "WR" written in the background.

I am looking at my old original beat up crystal and the new one and that my watchmaker says is plastic and I can't tell the difference. What can I look for to tell if it's hardlex or plastic?

Thanks!
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Old 08-10-2019, 07:53 PM   #2 (permalink)
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Lightly spin the crystal like you would a coin on a table top. A mineral glass crystal will have a similar sound to that of a coin as it spins to a rest. A plastic crystal will sound like plastic.


You should also be able to tell the difference in the weight of the two.
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Old 08-10-2019, 08:12 PM   #3 (permalink)
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We can not tell from a picture what the material is. But mineral is glass, so does it feel like glass or plastic? You can tap it with your fingernail, or with a blunt metal object. You should be able to tell if its glass or plastic.


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Old 08-10-2019, 11:35 PM   #4 (permalink)
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Honestly it doesn't feel like plastic. I'll probably bring it to a different watchmaker.
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Old 08-11-2019, 12:16 AM   #5 (permalink)
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Quote:
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Honestly it doesn't feel like plastic. I'll probably bring it to a different watchmaker.

You might take a craft knife and attempt to shave a tiny piece off the edge of the crystal. If it's plastic it'll work, if it's glass it won't.
I once told my watchmaker the beat up crystal in a Seiko he was going to sell me was definitely plastic (I'd already looked up the part number). He swore it was glass. Even very experienced people can make mistakes (him, not me, in this case ).


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Old 08-11-2019, 12:55 AM   #6 (permalink)
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Drop it in water. If it attempts to float it’s plastic. If it sinks quick then glass.
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Old 08-11-2019, 02:20 AM   #7 (permalink)
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If the watchmaker isn't familiar with those type of seiko, they might have not seen a glass that is domed that way. High dome crystals (with high side walls) are typically made of plastic. The domey-ness of crystals are usually a different type of curve (like a round bowl but shallow)
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Old 08-11-2019, 06:39 AM   #8 (permalink)
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Quote:
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Drop it in water. If it attempts to float its plastic. If it sinks quick then glass.
Good one!
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Old 08-11-2019, 09:54 AM   #9 (permalink)
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Quote:
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Drop it in water. If it attempts to float its plastic. If it sinks quick then glass.
It sunk immediately! Good tip, thank you very much!

I'm kinda annoyed at the watchmaker now. He said he could get me a mineral glass one for $95 CAD and the one I had was plastic. Careless...
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Old 08-11-2019, 02:12 PM   #10 (permalink)
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Quote:
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It sunk immediately! Good tip, thank you very much!

I'm kinda annoyed at the watchmaker now. He said he could get me a mineral glass one for $95 CAD and the one I had was plastic. Careless...
It's what my father used to call smelling a pound note.
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Old 08-11-2019, 02:47 PM   #11 (permalink)
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If it floats do we burn it?
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Old 08-11-2019, 07:56 PM   #12 (permalink)
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Well, if it didn't drown - it's a witch. Burn the witch!!
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Old 08-11-2019, 08:29 PM   #13 (permalink)
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Quote:
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Drop it in water. If it attempts to float its plastic. If it sinks quick then glass.

Non-destructive. Nice.


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