This pin belongs to a 6 pin blind box mystery box. This pin specifically is for the top right corner piece which features Cecilia behind her work desk. She is wearing a green dress with a blue fluff collar. Set #150789, Randall #150790, Sulley #150791, Cecilia #150792, Roz #150793, Mike #150794, Boo #150795.
The back of the pin is black metal with one pin post and two nubs. It has the Loungefly crown logo debossed on one half of the pin. Bottom half reads Disney/Pixar trademark, Made in China, Frabique en China, Hecho en China, and FAC-065120-21142