After a periscope was recently posted I thought Iíd post mine too. I've written below what I believe they are, if anyone has differing opinions Iíd be more than happy to hear it and learn especially regarding the homemade looking models, all apart from the Duerr were bought before having the internet.
First up is my favourite, a private purchase Lifeguard periscope made by F. Duerr & Sons in Manchester, England. Duerr is a family run jam making factory thatís still going today under the same name. I believe the inventor (Edgar Duerr) saw a money making scheme back in the war however, not knowing the cost of manufacture perhaps it was a non profit making idea?
I donít think they were very practical and at a cost of 15 shillings as shown in my example, probably something an officer might use which is also indicated by the picture on the spare mirror wrapping, not sure if the polishing cloth is original but I like to think it is.
A more or less identical model was made down in Melbourne by JW Handley Pty. Ltd., a manufacturer of military optical equipment in WWII, itís known as the Pocket Periscope MKI, has a broad arrow and 1943 date. I'm still after one of his MKI's.
F Duerr & Sons has made a limited edition of replicas in commemoration of the 100th anniversary http://duerrs.co.uk/mrs-duerrs-kitchen/ww1-replica/ Letís hope they donít fool anyone when they appear on ebay.