The only info I can confirm is the 375 mark is a European mark for 9 kt gold. Maybe researching hallmarks from Europe will give you a hit on your other marks.
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9k Gold get the thumbs up! by: Drew
Hello,the 375 is the percentage of pure gold in a piece of jewelry.375 parts of a 1000 parts pure gold. 14k Gold is 585 / 1000 parts pure gold, 18k is 750 /1000. The other marks are just likely the manufacturers logo and codes. 9k is less gold content, but is very strong and durable.
