Is there any indisputable model to value the brand of a company?

valuation of anything the word indisputable not used. 

for the value of the brand, you may adopt consumer-based brand equity.

 

 

Thanks for invitation,

I do believe that matter is completely related and depending on the industry and the product itself.

Yes. Thru qualitative research the value of a brand can be assessed. The scope of this research will largely depend on the nauter of the product.