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Do you have any family members names that would connect his lineage?
tattoo on left arm
on ship Geisha on March 9, 1945
tattoo on right arm
Dear Mr. Helle,
Thank you for posting your request on History Hub!
In addition to the information from the previous poster, we suggest that you search Ancestry, FamilySearch, United States Directories and online newspaper archives for mention of Hjalmar Jakobsen. There may be a fee for using these services. Please check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
If you are able to determine a location from the correspondence that your grandmother left, we suggest that you contact the courts in the state where he was living to request any records of his name change as well as searching the 1940 Census schedules, and contacting the Office of Vital Records for any of his records from that state.
We hope this is helpful. Best of luck with your family research!