Professor Valentine was a mystery when I blogged about him on March 18 this year, and so is Professor Reniff now:
This seems to be a draft version of the poster as it features alterations and a very PostIt-like note, but details of the venue or the date don’t survive. It’s believed to be from around 1873.
Has anyone out there heard of him? Let me know in the comments. I can’t find another reference to him anywhere.