It's a suspension stem, I think. Can't remember the name of the brand but it's something like Softride (but not Softride)
You are probably referring to the Allsop Softride, the stem Frischknecht used to have on his Ritchey back in early nineties.
Ha, no, never heard of him. Softride was just in my head because it's reasonably descriptive of what the stem does (and it's also the name of a bike brand).
@WimVDD started
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It's a suspension stem, I think. Can't remember the name of the brand but it's something like Softride (but not Softride)