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thanks for your answer !
Do you have a link to a pic of that kind of seal ?
Only kind of seal I think of is bale seals :
Looks like it was a seal. Tony
Sorry but that is not a lead seal. That it the top to a Lead Head Nail. They were used to hammer down sheet metal roofs and prevent the holes from leaking. I am 99% sure that is what that is.
I see where you are coming from on that, but it seems odd to me that the first pic seems to indicate a splined shaft. I think if that impression was made by a splined shaft, then the whatzit would have to rotate with the shaft. Every seal I've seen was fixed position while the shaft rotated. If that were the case on this item, you wouldn't see an impressions from the splines. Know what I mean?