This was probably the first range of hooks which were specifically designed by Albert Partridge as fly hooks. They were made with two varieties - down eye and up eye.
The up eye version was dropped as an offset hook was introduced in the “E” series in 1993 with a finer wire. The down eye version is still widely used for wet flies and dries.
It was field tested by Datus Proper in his book “What the Trout Said”, and came out on top of his list for strength. The Code A has a wide gape and an offset bend. Surprisingly it is not forged but is made from medium weight wire which accounts for its strength. This range is normally used for wet flies and nymph imitations, but a number of experts
recommended them as very strong and effective dry fly hooks. The bend is offset. Bronze finish.