On March 18, 2002 I visited the courthouse in Downieville and checked the Sierra County CA birth, marriage and death record indexes. The Sierra County Clerk-Recorder has birth records from 1857, marriage records from 1852, and death records from 1864. The early vital records are incomplete (not everyone registered the event). I did not check the actual record but only the index, which is available for birth, marriages, deaths, and various other county records. I found the following:
Nothing is listed in births and marriages for this spelling or a similar spelling.
11/12/1891 Wannemacher, Peter ---- Book 1, Page 004
I checked the Downieville Cemetery briefly (there was snow on the ground). There is a gravestone marker:
Died Nov. 12, 1891
Aged 62 years
& 7 months
(I did not check the Warnermaker spelling for B, M, D certificates.)