Along with Bruynzeel, Royal Talens is part of the Japanese Sakura Group. The company is perhaps better known for their Royal Talens Rembrandt soft pastels range.
Their pencil lines, manufactured since 1948, used to be made in Holland but that may no longer be the case. It is possible that this has been outsourced to other parts of the Sakura Group of companies. Stocks have been intermittent in the UK over the past few years which would indicate possible import from manufacture in the far East, through Holland. The company uses sustainable wood for the casings.
The non soluble version is a good quality wax based pencil of medium softness. The range has the advantage that all colours are lightfast to the American ASTMS 6901 standard.
The Watercolour Van Gogh pencils are marketed in similar sets.
The full sets come in 60 colours and singles were not available until recently. Single pencil import to the UK has now resumed and both sets and singles are now available - see below.
Sets of 60 wax type and watercolour pencils are listed by Amazon with supplies provided by Trinity Arts, and also other importers.
These are a pencil of good quality, and though the maximum of 60 colours is possibly due to the problems of achieving good lightfastness, this will make the actual selection of colours rather more limited than other brands, who supply up to 120 colours. However, the lightfastness benefit makes them well worth considering.
UPDATE: October 2024 - I have purchased a tin of these pencils, and find them lovely to use. I would want to find them for sale in open stock before using them seriously though.