perhaps the bolt is held and machined in a circumferential manner, such as when a part is held between centers under a surface grinder, and rotated so that the surface grinder makes it a cylinder. Except the radius of the wheel would limit how close adjacently you could come to the lugs and the bolt handle on either side at the common axial distance.
Alternatively what about a shaper running axially, and the part rotated under it, with different depth stops based on the angle. Because the two lugs are at different angles you would have a clear line to all surfaces so long as you put the part in one way for one operation then back in the other end first for another.
Then the lugs are cleaned up somehow, perhaps tapered facing with interrupted cuts. Or maybe they are taper faced as bands, then cut down into lugs with a shaper chiseling them off.
But the real question is what about the bolt handle, is that a separate fabrication that is welded on afterwards, or were the parts rough cast / forged then finish machined without the bolt handle getting in the way somehow, because I can't imagine they started from stock with a wide enough radius for the handle, or even off center with a wide enough diameter for the handle even. Too much material waste.