It's not a serigraph print or a later facsimile pixelated prod print. It's still in its orig, mid-20th c period walnut frame, w/a polished brass insert dec sleeve edge & has the NYC picture framer's paper label still affixed to the undisturbed & unopened brown paper dustcover on the verso. It's unsigned on the pictorial plane but since the work of art remains unopened, 100% undisturbed & exactly how it was when it was discovered & taken from the finely appointed Boston estate it was initially found in, it may be signed by the artist on the back of the paper.
There's some very minor, nearly unnoticeable tanning of the paper. The glycerin in the W/C paint is pooled & shiny in places.