Landscape-format Amsterdam letterbox The landscape-format Amsterdam letterbox with tilt roof is simple and straightforward. The letterbox is made of galvanised steel. Amsterdam is equipped with an opening stop for practical and safe removal of mail. The large flap is suitable for letters up to DIN C4 format. You won't get tired of this timelessly beautiful letterbox for many years to come.- with integrated opening stop- suitable for wall, fence and post mounting- with nameplate insertion