The first GRP Mirrors were produced in March 1986 for Bell Woodworking by Ferranti. At that time sail numbers were 68076 and above. They are easy to spot, they had hollow topsides (i.e. the hull sides above deck level) and very rounded corners inside the hull where the topsides meet the aft and the bow transoms, following in plan view, the profile of the normal bow shapes and quarter knees. Constructed using chopped strand mat. Similar deck layout to most wooden Mirrors (i.e. Mk2 interior) but no inner gunwales, no bow shapes or quarter knees.
Some of the buoyancy tanks may be connected via the hollow topsides (one boat had the bow tank connected to the stern tank !). The drip rail above the cuddies, and the lower part of the skeg are wood.