1730 Austro-Hungarian Empire Plate??

[nikmane]

Hi all!
I need help to identify this plate, or half plate.
Dimension: 32 mm x 28 mm x 0.82 mm
Thank's!

 

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[nhbenz]

Part of a neck stock clasp perhaps?
Similar to:


Or or the one here: https://finds.org.uk/database/artefacts/record/id/631484