My great grandfather's half brother, Gustaf Constans Petersson (born 21 May 1854) was born in Mönsterås and lived there until 1870, when he is shown in the moving-out records as leaving for Södertälje. The moving-in records for Södertälje are missing for that period, and I can find no trace of Gustaf anywhere after that. He is not in the dödbok on this website, he is not in the indexes on ArkivDigital, he completely disappeared. I have also searched emigration records, and can find no trace of him there, either, although his absence from the dödbok tells me he probably did emigrate. There is a Gustaf Petersson from Mönsterås who left for Racine, Wisconsin in 1882, but I've established that he's a different Gustaf...
His father Magnus was a sailor, and had another son born in Södertälje in 1869, so I'm guessing Gustaf was going there to join his father (and his father's girlfriend.)
Any suggestions for where I might find Gustaf Constans and discover his fate? Thank you!