Birth : 1872 - MASON - John Middleton Leggett - Mother: Mary Ann - Father N/R
[Registered at Wanganui ]
The above forenames are quite distinctive and maybe the child's mother was naming him for his father

There was a John Middleton LEGGETT in NZ who died at Dunedin in 1912 aged 78 (bc 1834). Cemetery record (Notes) gives native place as "Norfolk Island*" with what seems to be a correction, "*Durham" ? Years In NZ : 40 = arrival c. 1872.
From a rootsweb thread - 1999, a lister has copy of marriage cert. (purchased in error) for John Middleton LEGGETT to Sarah Mabel TAYLOR, 27 February
1873 at Greymouth.
NZ BDM has birth of Harriet Mabel LEGGETT - 1874 - to this couple, and a death, 1876 of Sarah Mabel LEGGETT aged 23 yrs.
Probably same man ? ... marriage
1886 John Middleton LEGGETT -
Annie Edith PALSER. ["Otago Witness" marriage notice 13 March 1886 / page 17 ... LEGG
AT - PALSER gives bride's name as "Hannah". She's variously Hannah or
Anna on e/rolls and Dunedin cemetery record.]
John Middleton LEGGETT first on voting rolls 1875-76 - West Coast / Grey Valley.
Later he's a publican at Hampden for a while. 1896 he's at Dunedin (occupation: expressman) with
Anna Edith, where he remains until his death, 1912.
[Have just added above info in case it transpires there's a link to your Mary Ann. ]
~ Lu