Mint-green enamel compass pin

Hey, I lost my mint-green enamel compass pin yesterday around 3pm in Nottingham. It was outside Market Square by the tram stop on Maid Marian Way when I noticed it was gone. The pin is tiny—about 1.2 cm across—with a matte finish and a small dent along the rim. The back has a butterfly clasp and faint initials 'AF' engraved. It was a gift from my sister and has sentimental value; I wore it every day during my first week at work and really need it back. If anyone found it, I can meet in the city center to collect.