I have no knowledge about how LEGO or Prima to tell, but...
I think you are wrong about why Prima used its name on the paper boxes.
My father inlaw recently made a discovery on his attic that when read without ”pics to prove” seems like a fantacy story.
He was clearing room up in the attic and was about to throw pur old big boxes from his childhood when he opened some that was from his earliest years. It included toys bought to him that his mother hid away because his age, gifts that she didnt think he was big enough to play with when he got them.
somehow she forgot to give my inlaw the toys and as he got older it never got used.
First he found 4 unopened boxes of the early Automatic Binding Bricks.
Then in the same big box he found 3-4 different complimentary smaller kits that had similar art.no but with higher number.
Then he found a sales magazine for the kits and that was really cool.
Its in swedish and on the pages it shows all the different thing you could buy at the time.
If you only bought one set, you could build a house as on the front of every box, then all bricks are used.
If you bought 4 sets you could build a mansion so much cooler.
Then for the kids who had all of that you could buy a few set of smaller boxes, wich combined made the mansion even better.
my father inlaw comes from a rich family so my guess is that they bought all sets available and directly thought that one day he will get them and would be able to buy the most luxorious mansion.
We tried to contact LEGO in Denmark recently to find out more about the complete sets and they were very happy so hear of a truly complete set. Its even in better shape than the one they have in their museum and the extra sets they didnt know about.
This is why I think you are wrong about why Prima used its own name when made in Sweden.
The LEGO admin could not find original parts manuals or the magazines in its archive because when it was first introduced in Denmark the factory had a big fire.
They couldnt find any legal papers on the time it was temporary made in Sweden in Gislaved because it all got destroyed -49 or -50 if I remember the response correctly.
The were happy to se the stamps on the inside of the paper boxes that were unknown proof of the temporary license the swedish company used while the danish company renovated its factory.
It was something about using the original metal forms for the plastic but I dont remember everything.
As far as value goes they could not help us with that.
They were interested but because it had all extra sets and information that they didnt even had seen proof of since it got destroyed it LEGOs youth.
I think it was loosely valued as around 40-45000$ but the money they could pay was sell. My father inlaw is not sure if he wants to sell or build it and store in a monitor at home just because he likes the stories he can tell, since he bever got to play with it when he was a small child.
First Im sorry about the bad english, im swedish and dont write in english very often.
Second I only give you the information LEGO gave us when we showed them how much pre LEGO things we had.
The answer to us when asked about the license for Prima was as written above. Im sorry if its not correct.
Anyone know where the best place is to sell it if we decide to take it to some of the online auction companies sales pages?
I started this account just to reply to this thread and dont know how to look at responses or mails, so please contact me on swedishoo7@hotmail.com if you have tip for me on selling the sets.
I promise, this is not a false story, and if needed I can take pictures of all the sets and original manuals.
It even has pricing, almost a months salary in total in 1949-50 when printed.
Have a nice day!