[Bonetools] Door hinge?

[Josje van Leeuwen]

Dear all,

This was found in a medieval monastery in Frisia (see attached). It's a
bovine metacarpus with a big hole in the centre. Around the hole are
concentric friction marks. They cover the proximal side of the bone next to
the hole completely. The distal side next to the hole is only partly
covered in friction marks. The backside was flattened by cutting, but has
no friction marks. Another hole was made in the distal end.
A second one was found in the same dig (but different context), also with a
hole in the middle but no friction (see pictures).

Could this be the lower (and perhaps corresponding upper) part of a door
hinge? The door could have made the friction marks...
Does anyone know any parallels? Or a different interpretation?

Many thanks in advance and greetings from the Netherlands,

Josje van Leeuwen
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