Psalter leaf now at Harvard, it was apparently unsold in the auction, and re-offered by Boerner in a fixed-price catalogue the following year:
It was given to The Met in 1939 by Sarah Gibbs Thompson Pell, and is now attributed to Swabia, c.1400:
"Prespiter Albert(us) hui(us) libri tibi munus. | Dat pia virgo p(re)ces p(ro) me peto ferte sorores"
And the nun's reads "Mater mis(eri)c(or)die miserere mei. Liugardi."
The Met description and a web-search suggest that the leaf is unpublished, apart from the Boerner catalogues, which is surprising for such an interesting and unusual miniature.