Regarding the Schleichtrumpetplayer.
I am almost 100% sure that the trumpetplayer 20047 never were made by Bully. If you check the marking you see this very large C which Schleich also used on the chimneysweeper made around the same time.
I think that this mold was made in 1974, but Schleich lost the rights to manufacture smurfs then and therefore it never were finished. When starting again in 1977 they picked this smurfmold up again and used it. So my guess is that it was never made before 1977.
But there is one important thing we have to know.
Only in 1977 Schleich made smurfs that Bully sold. And these some times had Schleichmarkings. For example the beatsmurf and latern had Schleichmarkings when Bully sold them. This Bully poster shows that suddenly in 1977, Bully adds a few new Schleichmolds to their articlenumberserie with only Schleichmolds. This also tells us that this was the year Schleich were allowed to make smurfs again. Also boxes tells us this. However it was not until late 1977 or 1978 Schleich got their old molds back when they started making smurfs for the Nationalpromotion.
That could be the reason it looks like the Schleichtrumpetplayer on the shelves in 1977. However I am almost 100% sure that in 1977 Bully was the only company delivering smurfs to the BP promotion in Holland if you look at all the other smurfs. That also makes me almost 100% convinced that when the shelves were made in 1976 the Bully trumpetplayer should be in that place. No other trumpetplayer existed then and the names gives us the exact 9 first smurfs Bully made and the ones they numbered 1 to 9.
Another thing regarding the marking. In the beginning the marking on the trumpetplayer only had the w germany- and C-marking and as you see they are exactly the same on both smurfs. The emblem was added in 1978 when they started selling it outside the promotion and also was given a articlenumber.