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Greetings, I am new at this but here is information on this watch. On the dial is "Seiko Beauty" and "Diashock 17 jewels Japan" Markings on metal are k18 in a box. A #5503. Inside of case has a flag, 750 inside a diamond # 098623. 17 jewels Seikosha.

I have not been able to find this "Seiko Beauty" model anywhere. I have found other Seiko watches that look just like mine but they have a different Seiko name on the dial, not "Beauty" Also,none of the watches on Ebay like this mention 18k. I am wondering if one of the marks indicates plated maybe over chrome.

Thanks for any help! Watchmen
 

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welcome to the forum...that is a very nice looking watch...i am not familiar with that model someone must know what it is....they will chime in here soon...
 

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Welcome.

In the early 1960's there were a few of the high end Seikos (GS, Chronometer) that used 18K cases. Since the movement is marked Seikosha I would think it is pre 1964 (someone with more knowledge correct me if I am wrong)

Nice watch (and I assume it is a womans watch based on the nomenclature of "beauty" on the dial)
 

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The watch is from the very late 50's or more likely the early 60's as others have indicated.

The case is solid 18K gold. The Japanese flag and 750 in a diamond indicate the purity of gold in the official Japanese rating system. If the value was 1000 it would be 24K, if it is 500 12K gold. Below is a quick table with the values.

Carat - Value
24 - 1000
22 - 917
20 - 835
18 - 750
15 - 625
14 - 585
12 - 500
10 - 417
09 - 375

There is a similar rating value listed on silver cases with the following steps.
1000
950
925
900
800
 

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Do you have a pic of the movement please?
 
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