Specificity of a noun may be indicated by a following NP containing the numeral uŋ/uŋa, e.g. um paav uŋa 'a (certain) log'. See also Example 60. (This construction is also used as a partitive, e.g. elisu ooy uŋa 'one of his eyes'.)
Although this looks like N + postposed article, it is better treated as an appositive NP because (a) the numeral "one" is in nominal form, i.e. the form in which it appears as an independent NP (cf. noov graandi uŋa 'a new big one') and (b) the numeral 'one' may also occur within the first NP, as in the first example above.
Source: Smith 1974-5: 5075
Source: Smith 1974-5: 5077