It might have been a Diavox(https://www.ericsson.com/en/about-us/history/products/the-telephones/diavox-1978 https://www.ericsson.com/en/about-us/history/produc

It might have been a Diavox(https://www.ericsson.com/en/about-us/history/products/the-telephones/diavox-1978 https://www.ericsson.com/en/about-us/history/products/the-te...) clone actually, but it was mainly the Cyrillic markings on the back of it...