This interesting cinderella stamp was provided by a colleague.

It was attached to a letter (unfortunately undated) written by Richard Langford Stephenson, born 1826 in Perthshire, Scotland. His career in the church led him from Montreal to Buckingham, Canada East to Pakenham and Hawkesbury, Canada West and then to Perth, Canada West (Ontario) where he was Rector of the Anglican Church from 1857 until his death in August 1893. The stamp is most likely a portrait of Rev. Stephenson, and based on the portrait, I would guess that the stamp was printed in the 1870's or 1880's.
If anyone has similar types of stamps showing portraits but no other inscriptions, please share images and information. Thanks!