57c from a right handed round zinc spare via zinc flattened from 3X [end flaps (c) 1977], 8X [9 manual 1977 variant] and Super Highway, 2 right and a left handed variant, to A157 black with a straighter barrel, wider groove, and no pin, with indented spots on the flat above the barrel that look like mould ejector pins, 2 on that from an M&S Vintage Set, 0530, 1 on that from 7080 25 Multimodels, Shenzen 2013