Your post indicated that Clarence died in Coos Bay, OR. Coos Bay is in Coos County, whereas the OR Death Index lists Clarence's death place as Linn County.

Nevada Marriage Index, 1956-2005
about Clarence E Jacobia
Name: Clarence E Jacobia
Gender: Male
Residence State: Oregon
Spouse: Velma Monroe
Spouse residence state: Oregon
Marriage Date: 26 May 1977
Marriage city: Winnemucca
Officiant type: Civil celebrant
Recorded date: 15 Jun 1977
Recorded city: Winnemucca
Book: 99-
Page: 61

Oregon Death Index, 1903-98
about Clarence E Jacobia
Name: Jacobia, Clarence E
County: Linn
Death Date: 27 Jun 1991
Certificate: 91-12437
Age: 55
Birth Date: 6 Sep 1935
Spouse: Velma

Various historical newspaper collections include news items mentioning Clarence JACOBIA; contact me at my email address if you're interested in receiving these newspaper pages:
maryfobian@comcast.net