I was a picture researcher for quite a few years, mainly for BBC TV News, but also about 3 years working for Clive James. Establishing ownership of photographs and negotiating copyright fees was a major part of my job.
If you found your Perkasa pictures in a book or magazine, there may be a credit to the owner or picture library that markets the picture. If there is no indication, the next step would be to contact the author/publisher of the publication.
It depends on what you intend to use the pictures for. There is no requirement to pay copyright if the pictures are to be used for research. If you intend to use them in a book or magazine article, you must show that you have made a good effort to try to establish who owns the copyright.
That's about all I can say about copyright, but I moved away from that job in 1996, so a lot is likely to have changed, especially with the development of the internet as source of often un-credited material.
I also have a thing about the Perkasa, in fact I bought a ready made (as in factory, not another modeller) Perkasa only this morning!
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