We won't ask Gordon ... But the guess is that these heads that belong to an engine block that a reader on the Black Market in Beverwijk found are Chinese. The Chinese have a fairly large number of 'brands' such as
Chang Dong
Long Teng
Feng Tong
Xiang-jiang
Guanjun
Jinguan
BMW clones manufactured.
And this could just be one of them.
Anyone have any idea?