Good Morning Walter,
I am the great-great grandson of Carl August Petersen who had a saddle-making shop in Svendborg on Mollergade. He and his wife had 14 children including my great-grandfather Axel Petersen. We went to visit Svendborg and saw the house on Mollergade. We also went to the Svendborg archives and saw a photograph of Carl and 8 of his 10 sons on a dock at his 50th wedding anniversary celebration in 1917. I believe Valdemar may be one of the sons. This photograph has demographic information about each of the men in the photograph typewritten by Carl Schreiner in 1990 (not sure of the full name...I need to look in my records, and I could send the photo when I get home) The archive included a wedding photo and a hand-written account book from the saddle-making business.
I also researched census records and found out that either Carl August Petersen or his father (Peter Christian Petersen)was born in Korsor! I hope this helps - more to follow...