✅ SOLVED Small copper discs with "protrusions"

[MetzKaj]

Found these little buggers on the field yesterday. First time finding these so I was wondering if someone could ID them. They are not the right shape for roves (right?), but they kinda look like 'em. It seems that there are some differences in sizes, but largely around 1,5 cm (0,6 iches). Other finds were pretty modern (19th century-ish), so I don't expect anything old.

Thanks in advance!

 

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[Blak bart]

They come from a musical instrument.....possibly an accordian, or similar instrument. They open and close to allow airflow/sound !!

 

[Mud Hut]

Roves is right for asbestos, slate, and terracotta.

 

[ToddsPoint]

 

[Red-Coat]

We call them 'tail rivets" on this side of the pond and they're generally used for securing roofing tiles or slates. They're usually copper and older ones often have an octagonal rather than round head. They're secured as shown below (and note that they don't have a sharp point, unlike the roofing nail shown above):

 

[MetzKaj]

Many thanks y'all! Mystery solved.

 

[Blak bart]

I was mistaken....I learned something new !!