Anti Aircraft Shell Head Fuse

We believe this item of trenchart to be from a 3.7" or 3.9" WWII AA shell which has been display mounted on a hardwood base. The fuse is clearly marked with no. 199 1V FL 10/38 and RL 12/38 537. It has further engraving of an omega sign, safe and a small broad arrow, together with a 0 to 30 scale. The various components unscrew and it makes a decorative display item. Due to international regulations, this item is restricted for sale to UK based collectors only. Measures 4.25" high excluding base (10.5 cm)