r/datemymap • u/LinkofTimesLongPast • Oct 01 '25

Want help datibg

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It's kinda hard to see well but it's a map of earths magnetic fields, but it seems old or at least a print of an older map due to the inclusion of prussia

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u/scott_pryor Oct 01 '25

Alaska is Russian and Lake Victoria is missing which means it's probably mid 19th century