Oxford IMP Antique Brass Internal Door Knocker

This OXFORD IMP door knocker measures 4 3/4" in length and is of solid brass. These little" knockers" were used on internal doors such as bedrooms and bathrooms as the old English houses usually did not have door locks. In the early 1900's such pieces were also produced as souvenirs from the various towns, cathedrals, tourist spots etc. They usually date from around 1910-1920. I cant find any history on the Oxford Imp so dont know where he was supposed to have 'hung out' !