DGR's source text for this translation is the sonnet numbered LXVII in
the Boccaccio section of the collection
Raccolta
di Rime Antiche Toscane
As WMR's Fiammetta
The two related translations are
The mid-rhymes (bc) in the octave are off rhymes of each other, so that the rhyme scheme might well be described abbaabba. In that case the metrical structure of the translation would be exactly correspondent with the original Italian text.
As with most of DGR's translations of the early Italian poets, the date of this one cannot be determined with certainty. It is probably one of the later translations.
The translation was first published in 1861 in
The
Early Italian Poets
Dante
and his Circle
Raccolta
Opere in versi