One way I think this could be made is by taking a longer bolt with a nice head, screw the thread into a set of nuts, clamp the nuts in a drill chuck, set the drill chuck to rotate slowly and then either with a fixed file, better still with a ribbon grinder or other bench grinder grind away at the head until you reach the desired shape... then cut off the bolt at the desired length. If the head has sufficient axial extension and is a hex head you can leave some of it in place to have some purchase for a spanner to fix it.
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