Well I am a little confused - the way I read it a Dolton - no Christian name given - was born in Hamburg early 1840's ? I have found
Frederick Augustus Dolton born 28th October 1845 in Hamburg
father John Dolton
mother Mary Allen
this man married in Sydney ,Australia and died in Sydney Hospital on 9th May 1911
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this is the only Hamburg based Dolton birth I can find - if it is the man you are looking for ??
Married 22 December 1873, Sydney, New South Wales, Australia, to Margaret Gilson 1852-1926 with
M William Augustus G. Dolton 1875-1875
F Emily Ellen Jane Dolton 1876-1960
M John Frederick George Dolton 1879-1884
M Richard Charles Frederick Dolton 1881-1951
F Victoria Amelia Mary Dolton 1884-1975
M Bruce Stanley Dolton 1886-1960
F Wilhelmine Isabel 'Minnie' Dolton 1889-1972

this info is on a tree owned by a lady named Leonie Peers....not all trees are 100% correct though -