Usually I can decipher most writing but this one is a bit of a mystery. Looks like M with a line above it implying some missing letters followed by Shurston. He may be a master in Chancery in England
What do you think?
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSH3-97RM-2?i=9&cat=185720

Chancery.jpg