Hello Paul that is a very attractive model yacht, no wonder you love it!
The sails are new and modern also the sail booms are simple the 'boom vang' sometimes known as a Cunningham at the base of the main mast is a modern type.
I assume there are no numbers at the top part of the main sail?
The cover with the S L Model Yacht Club might ring a bell with some other members of the forum. The hatch cover looks original. The deck looks like it has been drawn on by a master, it looks perfect.
It seems to have a cambre and it could be the original deck. Is it possible to see the edge of the deck where the cover fits? If so is this a single piece of wood? That was the norm for pre-war 2 model yachts. That is before the more common use of plywood.
The completely faired in keel hides the lead cast weight and the rudder is positioned to allow for a vane steering system also the main sail allows space at the stern for the vane mechanism. Another possibility is that the restorer went for a high aspect ratio sail.
My fairly positive guess would be that this is an old hull that has had a complete make over. I suspect it is from the 1950s as the hull looks a bit familiar.
As the 1960s approached then the glues became more available and reliable and as good wood was not so easy to obtain then plank on frame construction was being used. Prior to this plank on frame was mainly screwed in place with a bitumen or red lead sealant.
Quite a neat job of updating to radio control.
So to sum up probably 1950s, nice touch to keep the hatch cover as it was. New mast (probably) and new sails, I use the same dress fastener system to attach sails to the mast, where there is a 'jack-stay' tight on the mast ( should be taut but not bend the mast) to keep the main sail free to move with the wind.
Does she sail on a beam reach (sails out about 30 degrees) 'hands off'? I would be interested to know.
Lovely job, perhaps you could send me a PM as to how much you paid for the yacht?
Good luck sailing her
Roy