when was it first published?
Autumn 1952
Nebula Science Fiction
The first issue was dated Autumn 1952, and sold 4,000 copies.

what is nebula science fiction? First Scottish science fiction magazine
wiki:7353844
Nebula Science Fiction [SEP] Publishing history
A further quarter of the sales were in Australia, another third in the US, and nearly a tenth in South Africa. At the end of the 1950s, first South Africa and then Australia began to limit foreign magazine imports, for economic reasons, and when this was followed by UK excise duties the magazine was quickly in debt. Hamilton was forced to cease publication with issue 41, dated June 1959. Hamilton had also had health problems which contributed to his decision to stop publication.