Any books or Websites on Vintage Japanese pearl Jewelry names and/or marks?

A Breaker

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My husband and I are very interested in the Japanese pearl jewelers names and marks of the Post WWII era. Are there any books or websites that might have lists or info.?
 
Thank you! I am still not finding much about the post WWII pearl industry in history.
 
I found something about Sakata A quote "I know Sakata. I lived in Japan 1971 to 1975. Navy. Sakata Pearls were highyly recommended by a Japanese friend so I went up to Tokyo-met with company representative and they designed my necklace/bracelet with me. Choker (4 strand) and bracelet so I could extend the length of the necklace beyond the choker-when I wanted. They are beautiful. Sakata registered them for me. I came across your posting because today I am trying to organize my jewelery for my will. I wanted to get an idea of the value." Anyone have a logo for Sakata?
 
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I also found that Seiko made pearl necklaces as well. A bird flying (Swallow?) in a rectangle.
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Fuji Pearl...I don't know much about them. They were around early with K. Mikimoto. They started using a trademark in 1948, Registered it in 1959. So previous to '59 they had a different clasp. It was renewed in 1979. But it isn't clear when they stopped operating.

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Thanks...(Not my photos). I thought it would be helpful when people ask for Pearl Maker ID for their inherited pearls. to have them all in 1 place. If you have any to add, please do! (I just read somewhere..that there was a disaster or economic downturn that caused many Japanese pearl jewelry companies to go out of business in the 50's & again in the 80's) So it would be nice to have a record of these, since Google does NOT help.
 
Quite an interesting stroll down Akoya Memory Lane!
 
Another mark: there are two hallmarks on it, but that could make sense. The one on the left in your first image is an old Mitsukoshi mark. The character is "koshi" and it was their "maru ni koshi" mark, which really just means koshi inside a circle.

The second mark looks like an MP which is probably Mori Pearl. They sell (or at least sold) pearls through Mitsukoshi. (From Jeremy)
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