Beloved cat missing (Abington)

Our cat Muffin is missing since Saturday 11:00 am. He is a domestic short hair cat. He is white with brown tabby spots on his back, upper part of the face and tail. He is very friendly, loving and vocal. Although he has good survival skills, he is an older cat (12+ years old) and has a heart condition that requires a daily medication. He is microchipped. We would appreciate any sightings or any other information.