Today being the transferred Feast of the Annunciation itv seema asuitable day upon which to post theis link to a post linked at the beginning of February this year by Kurt Sherry
Medieval Religion discussion group. His wife thought the lack of a veil on the figure was curious:
Elisabeta Negrău posted the following comments on the depiction:
This Dura-Europos figure of a not-veiled woman, presumptive BVM, is not singular in Paleochristian art.
Other such images can be seen at:
a) the seemingly contemporary Catacomb of Priscilla, a nursing Virgin Mary: https://dlib.york.ac.uk/yodl/app/image/detail?id=york%3A806466&ref=browse
and b) Santa Maria Maggiore (post 431), the Annunciation: https://www.flickr.com/photos/paullew/10974655144
However, this Dura-Europos image might be the first (presumptive) Annunciation at the Well known [to survive] today.