Porcelain clown doll

I believe the head and feet might be bisque and the hands smooth porcelain.  The elastic on the clothes is shot. There's a little thin chip on one foot.  Other than that he seems in great shape. I just can't for the life of me figure out who the doll maker is. The only identification is an engraving on the back of the neck.  It looks like vital signs you might see on a hospital monitor.  One short sharp point followed by a long one and then another short one. I think he's before the 80s because he belonged to my great aunt 

Fair