Just purchased from OKB Grigorov....... http://shop.okbgrigorov.com/
A resin kit of the Royal Navy submarine R10 - launched in October 1918 - just to late for the Great War.
At just14cm (5.5in) long, the hull is a single superb resin casting - with a separate conning tower and etched brass parts for the diving planes, propeller etc..
The service from OKB was great - just a week from order to delivery - although the box with the hull/brass/instructions arrived first, followed a week later by the conning tower in a separate Jiffy bag!!!