A First World War period trench periscope by W. Watson & Sons, detailed 'No. 4 Mk. 1 1917 No. 1222', length 43.5cm.Buyer’s Premium 29.4% (including VAT @ 20%) of the hammer price. Lots purchased online via the-saleroom.com will attract an additional charge of 6% (including VAT @ 20%) of the hammer p