Hello Paula!
Could this be your Mark/Marco Del Vecchio? Born 1841...
Informant for the death certificate was Vito A. Delvecchio (a son?)
Name:
Marco Del VecchioEvent: Death
Event Date:
07 Feb 1912Event Place:
Philadelphia, Philadelphia, PennsylvaniaGender: Male
Race: White
Age: 70
Estimated Birth Year: 1842
Birth Date:
01 Nov 1841Birthplace:
ItalyMarital Status: Married
Spouse:
Father:
Father's Birthplace: Italy
Mother:
Mother's Birthplace: Italy
Occupation: Rancher
(an error?
)Street Address:
Residence:
Cemetery:
Burial Place:
Burial Date: 13 Feb 1912
Additional Relatives:
Film Number: 1405470
Digital Folder Number: 4009238
Image Number: 471
Reference Number: cn 3937
1900 Census for the same person...On this record, Mark is a tailor. The family below his, at the same address, is Vito A. Delvecchio, and he is also a tailor. Judging by the years of birth (Mark - 1841; Vito - 1869) I think it is a good guess that they are father and son.

I do not see Mark's wife on the census.
Name:
Mark DelvechioTitles & Terms:
Residence:
Philadelphia city, Philadelphia, PennsylvaniaBirth Date:
Nov 1841Birthplace:
ItalyRelationship to Head of Household: Self
Spouse:
Spouse's Titles & Terms:
Spouse's Birthplace:
Father:
Father's Titles & Terms:
Father's Birthplace: Italy
Mother:
Mother's Titles & Terms:
Mother's Birthplace: Italy
Race or Color (expanded): White
Head-of-household Name: Mark Delvechio
Gender: Male
Marital Status: Married
Years Married: 32
Estimated Marriage Year:
1868Mother How Many Children:
Number Living Children:
Immigration Year: 1881Enumeration District: 0069
Page: 2
Sheet Letter: A
Family Number: 22
Reference Number: 11
Film Number: 1241453
Image Number: 00423
Household Gender Age
Mark Delvechio M
Child Thomas Delvechio M
Child Carrie Delvechio F
Child Sara Delvechio F
Here is the image, but is a very poor quality

T.