The Royal 7000 is not that scarce they made them for something like 15 years. They are unique in that they where the only Transoceanic made with a BFO. A very nice radio the solid state Royal line the 1000, 3000, and 7000 as for as I am concerned are the best of the Marque. I have several of the older vacuum tube model the 500, and 600 series great radios but where not as portable and the Transoceanic Royal series.
I should point even though the made a lot of the Royal line radios they where not considered collectors items, as much they are today so finding any of them in good condition is a real find. What is interesting is it is easier to repair the older vacuum tube Transoceanic then the solid state models.