It's been awhile since you posted, and may have already found the following.
John Martinek Jr, "Ohio, County Marriages, 1789-1994"
Name: John Martinek Jr
Titles and Terms:
Event Type: Marriage
Event Date: 29 Jul 1938
Event Place: Belmont, Ohio, United States
Birth Year (Estimated): 1912
Father's Name: John Martinek
Father's Titles and Terms:
Mother's Name: Mary Ramaza***********
Mother's Titles and Terms:
Spouse's Name: Helen Wojciechowski
Spouse's Titles and Terms:
Spouse's Age: 20
Spouse's Birth Year (Estimated): 1918
Spouse's Father's Name: Ignatina Wojciechowski
Spouse's Father's Titles and Terms:
Spouse's Mother's Name: Elnora Tyska
Spouse's Mother's Titles and Terms:
Reference ID: Pg. 64 No. 19434
GS Film Number: 2134418
Digital Folder Number: 004022806
Image Number: 00617
Belmont Co 1918 WWI Draft Reg John states nearest relative is Mary MARTINEK, Jablonka Austria.; 1942 Draft ....middle name is Frank
This is probably the reason such a huge age difference between John Jr and Henry. It looks like he didn't send for her until abt 15yrs after John born.
John Sr d 6-1972. The Bellaire [Pultney Twp] Public Library might have his obit.
WOJCIECHOWSKI info http://familysearch.org/search/record/results?count=20&q...