Mystery Object

Just about to hit the sack, desperately unhappy that I had failed to Blip (and less than two months into it, too) when I spotted this on the bench. I enjoyed the contrast between the textures in what is a solid object. Cast, forged and machined steel.

Oh yeah, it's the injector pump drive coupling for a Fordson Super Major tractor engine. It was on the tip of your tongue, don't tell me.