Unfortunately we have very little information. As far as we know Carl was born in St Petersburg sometime between 1850 and 1855. All our info is from censuses and marriage. When he married in London in 1891 he was 37, born ca 1854, father Peter, a tailor , deceased. 1891 census, dob 1854, in St Petersburg, Russia. 1901 census dob 1854, Russia (Swedish subject). 1911 census dob 1855 Russia. 1921 census dob Jan 1850, Petrograd. Died in 1928 at age 78. Never used a second name. The surname was anglicised first to Quarnstrom, then to Quanstrom
He is pretty consistent about where he was born and that he was Swedish. Finding any trace of him is another matter!
Thanks again