Yonex "Yoneyama King Dia"

[Samn]

I have done multiple research on this specific model of Yonex, dating from before its rebranding, and have only found it as being displayed in a museum. As it was an early Yonex model, there are no marks to determine its authenticity. However, it was a complete match to the given description, including its material and dimensions, found on the following website:

Start je zoektocht naar uniek erfgoed

I would appreciate it if you could provide an estimate regarding its value.
If it end up being an authentic antique.

 

[Samn]

I have done multiple research on this specific model of Yonex, dating from before its rebranding, and have only found it as being displayed in a museum. As it was an early Yonex model, there are no marks to determine its authenticity. However, it was a complete match to the given description, including its material and dimensions, found on the following website:

Start je zoektocht naar uniek erfgoed

I would appreciate it if you could provide an estimate regarding its value.
If it end up being an authentic antique.