Are these Ilmari Tapiovaara chairs?

Hey all,

I have 6 dining chairs that might be Tapiovaara spindle back Fanett chairs (the model without the slight fold in the front). The mark on the bottom is very faded and cannot be read, but from a Google search it looks like it might be made in Yugoslavia. There also seems to be an upside down triangle under the circular mark.

I would love to know if anyone has seen this stamp before or if anyone has any further thoughts about the chairs’ provenance.

Thank you!

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