Keystone / Philadelphia Watch Case Co. Gold Filled Case Hallmarks

Discussion in 'American Pocket Watches' started by Hairspringz, Jan 15, 2020.

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  1. Hairspringz

    Hairspringz Registered User
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    25 year gold filled 7.jpeg 25 year gold filled 7.jpeg Hello, is there a list or catalog of gold filled Keystone Co. pocket watch case hallmarks?
    Can anyone determine the gold Karat from this hallmark?
     
  2. Hairspringz

    Hairspringz Registered User
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    also can the year rating be determined from this one? 14k gold filled 7.jpeg 14k gold filled 7.jpeg
     
  3. Keith R...

    Keith R... Registered User
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    Go up top to Encyclopedia, go to search, type in Keystone, go to Keystone watch case Co.
    and enjoy.

    Keith R...
     
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  4. Hairspringz

    Hairspringz Registered User
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    Well, I have been enjoying the encyclopedia for some time, and there is plenty of useful info, just not what I'm looking for.
    I was hoping someone would have a list of all known hallmarks, because some I can't find.
    Example; the 25 year one I posted in the OP, I can find it,.but it always has the gold content with the mark or a name / symbol under it.
    I'm guessing the Keystone case serial numbers are useless for determining gold content etc.?
     
  5. Robert Sweet

    Robert Sweet Registered User

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    Keystone Watch Case Co. - Trademarks …………….

    Robert

    Trademark Keystone - Page 1.png Trademark Keystone - Page 2.png Trademark Keystone Page 3.jpg
     
  6. Hairspringz

    Hairspringz Registered User
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  7. Jim Haney

    Jim Haney Registered User
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    Cases marked with the years they are warranted are Gold FILLED, therefore, because they are Not Karat Gold there is no need to list the purity because it is not pure.
     
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  8. Hairspringz

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    Yes, but the gold content makes a difference :) thus the different marks, and someone at the factory obviously kept track of the gold content of the plate they were pressing. Then made it a point to indicate the different gold karat in most cases either through a name or simply marking the content after the mid 20's.
     
  9. Keith R...

    Keith R... Registered User
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    I have this in some of my early cases and represented their top of the line
    GF case as shown in post #5 by Robert.

    Keith R...

    jas boss (350x318).jpg
     
  10. Jim Haney

    Jim Haney Registered User
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    Yes, There is different content in GOLD FILLED cases, most are either 10 or 14 K FILLED, that means a base metal is coated with a layer of gold. It is not solid gold.

    Some of the higher quality gold filled Hamilton cases were marked Permanent, which indicated the highest thickness of the filling, however it is not Gold.

    What are you trying to find out by your questions that you don't understand, maybe we are not reading your questions correctly?
     
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  11. terry hall

    terry hall Registered User
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    i read into the OP's query is the actual content of the gold in the particular case...

    and yes, depending on the quality mark 10year 20year...etc there is a difference in the gold content.... even though the case is gold filled and not solid gold

    try poking around here...some of the calculators may assist. gold filled scrap - Google Search
     
  12. Robert Sweet

    Robert Sweet Registered User

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  13. Christopher Burris

    Christopher Burris Registered User
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    Ok, but couldn't we say, with a 25 year warranty, more than likely 14K gold fill or gold plate?
     
  14. Les harland

    Les harland Registered User

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    The marks on a Gold Filled item are not Hallmarks as we know them
    They are makers marks
    Only solid Gold items are Hallmarked
    The term "Guaranteed Twent Five Years means that the amount of Gold is the amount the maker believes will last twenty five years
    General wear and tear means that there is less gold now than when the item left the factory
    Gold is a relatively soft metal so low carat gold will last longer than high
     
  15. Robert Sweet

    Robert Sweet Registered User

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    FYI,

    This copy has a couple of Keystone trademarks that were not displayed on my post #5.

    Robert

    Trademarks of the Jewelry and Kindred Trades - 1950.jpg
     
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