I'm writing this article mainly to get it out there to be recognized by search engines whenever someone searches for something like "knight's head silver mark". This is because I receive enough questions about this mark to make me think it's a mystery to many.
The mark was one of several used by Simpson, Hall, Miller & Co. of Wallingford, CT. When International Silver bought the company, the mark continued to be used. If someone is trying to identify a pattern with this mark, a search should include both Simpson, Hall, Miller & Co. and International Silver.