Silly me forgot the Prouty. Ok, found his 1918 draft card living in Lynn MA. Born9 Dec 1898, worked as a conductor on the railroad. Next of kin Hattie H Prouty his mother. The 1900 census for St Albans has Hattie's mother as Olive S Hull.
Family search has a possible birth record for Bakersfield VT Hattie Hamilton Hull born 7 Oct 1871 to Lyman M Hull and Olive S
William C parents groom card has parents as CC Prouty and Sarah ( I think based on the 1880 census for Bakersfield VT this is Christopher Prouty)
Family Search also has the bride record:
name: William C. Prouty event: Marriage event date: 01 Jan 1884 event place: Vermont, United States gender: Male spouse: Hattie Hull spouse's father: Munson Hull spouse's mother: Olive film number: 540103 digital folder number: 4357257 image number: 4790