There was an Otto Spromberg, born 12 Nov 1902 in Washington. His father was: Max Spromberg, born Germany.
1910 Census, Clearwater Idaho
Max Spromberg 45 Immig 1888? b Germany Farmer
Zola wife 28 b Iowa
Max 12 b Washington
Amelia 8 b Washington
Otto 7 b Washington
Alma 3 b Washington
Bertha 1 b Washington
1920 Census, Tumwater, Chelan, Washington
Max Spromberg 50 Immig 1884 Naturalization 1892 b Berlin
Max F 21 b Washington
Otto B 17 b Washington
Marriage: Otto Spromberg married Verna Guilford on 29 Nov 1922 at Yakima.
1930 Census, Longview, Cowlitz, Washington.
Otto Spromberg 28 b Washington Crane Operator Lumber Mill
Verna 24 b South Dakota
Mildred 5 b Washington
Richard 3 b Washington
1940 Census, Longview, Cowlitz, Washington
Otto Spromberg 37 b Washington Electrician Lbr Mill
Verna 34 b South Dakota
Mildred 15 b Washington
Richard 13 b Washington
Robert 5 b Washington
Death: Max F Spromberg
Date: 21 Jun 1953
Born: abt 1899
Father: Max F Spaulding? [I think this should be Spromberg]
Mother: Zola Northup.
Death: Otto Spromberg
Last res: 98632 Longview, Cowlitz, Washington
Born: 12 Nov 1902
Died: 17 Sep 1971
The problem is that you give initials for Otto's middle name (H.W.) and this doesn't show up anywhere on the above records. So I don't know if this is this Otto is the Otto you are looking for? ...Can you identify him from the above information?
Also, There was an Emil C Stromberg in Indiana, married with a child - but once again you give initials of S.P. so I am unsure if this is your ancestor. Can you say if the H.W you give Otto and the S.P. you give Emil were the initials of their middle names or do they refer to something else?