Thank you for the good posts. That is why I think the “Danske Modlebiler” book from Johansen and Hedegard (2002) is so special.
https://bibliotek.kk.dk/ting/object/710100%3A42833444
Even if they are dealers or auctioneers, they made the information available on so many unknown Danish manufacturers. Four Tobi Toy ads are published in their book, for instance. You must get a copy, if it is still possible. I assume their information (dates, etc) are a best guess since no other documentation was available to them.