I have recently been loaned an old photo album full of victorian era pictures - one of the few which is identifiable is of the above named person. I have yet to find anyone searching for Wilhelm on Ancestry or anyone who has him as part of their tree. If anyone is interested I am more than happy to scan and email a copy of the photo.
Wilhelm was born in Norway in abt 1839 and emigrated to Wisconsin - his naturalization record is dated 1893 - I believe the photo (CDV) was probably taken about 1880-90.
Not sure how the photo ended up in the UK but hope it can be an addition to someone's tree some day!