Hello Bev,
This is good news, it will take a bit of work, but this is the only way to find him.
Here are the marriages after 1890 for William Watterson.
From Brian Lawson Website - www.iomfhs.im/lawsons/LawsonBMD/Main_Site_index.html
WATTERSON, William Henry 25 Feb 1892 C rus 65 COLLISTER, Catherine
WATTERSON, William Edward 2 Mar 1893 C arb 39 QUALTROUGH, Catherine Isabella
WATTERSON, William 27 Apr 1893 C mal 113 KELLY, Charlotte
WATTERSON, William Thomas 15 Jun 1893 C mal 114 TAGGART, Christina
WATTERSON, William 2 Jan 1894 C rus 80 COLLISTER, Jane
WATTERSON, William Edward 30 Aug 1894 C mal 127 CAIN, Elizabeth Anne
WATTERSON, William Henry 9 Feb 1895 D bra 622a FISK, Mary Ann
WATTERSON, William 1898 P WM 34 QUIRK, Alice Jane
WATTERSON, William 18 Sep 1898 D bra 734b CLUCAS, Jane
WATTERSON, William James 3 Jan 1901 P fox 29 BELL, Edith Jane
WATTERSON, William Henry 20 Oct 1903 C mal 222 TAGGART, Sarah
WATTERSON, William Arthur 24 Sep 1904 C mal 233 KEWLEY, Elizabeth Catherine
WATTERSON, William Henry 28 Sep 1905 C rus 183 KARRAN, Isabella Margarfet
WATTERSON, William Frederic 7 Apr 1906 P ger 214 KEIG, Elizabeth
WATTERSON, William 27 Oct 1909 P ger 232 TEARE, Catherine Jane
Averil