Immediately after receipt of a safety convention certificate, a local safety certificate or a load line certificate, the owner or master shall cause it to be framed and displayed in some conspicuous place on board the vessel for the information of all on board, and shall cause it to be kept so framed and displayed so long as it remains in force and the vessel is in use: Provided that this section shall not apply in respect of any vessel of less than one hundred gross tons, if the Authority has exempted her from its provisions.