Keystone / Philadelphia Watch Case Co. Gold Filled Case Hallmarks

[Hairspringz]

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?

 

[Hairspringz]

also can the year rating be determined from this one?

 

[Keith R...]

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

Keith R...

 

[Hairspringz]

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

Keith R...

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.?

 

[Robert Sweet]

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

Robert

 

[Hairspringz]

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

Robert

View attachment 566253 View attachment 566252 View attachment 566251

thanks, but they still don't show that specific mark and list it as 14K or 10K

 

[Jim Haney]

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.

 

[Hairspringz]

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.

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.

 

[Keith R...]

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...

 

[Jim Haney]

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?

 

[terry hall]

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

 

[Robert Sweet]

FYI,

Robert

 

[Christopher Burris]

Ok, but couldn't we say, with a 25 year warranty, more than likely 14K gold fill or gold plate?

 

[Les harland]

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

 

[Robert Sweet]

FYI,

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

Robert

 

[Machine821312]

Is there anyway to tell the age of the case using the above hallmarks?