Found this from Google Gemini : 
Finding that 4230 stamp is the final piece of the puzzle! In German vintage toy cataloguing, a four-digit code beginning with a "4" or "42" specifically denotes the exact song number pressed into the mold.
The Song & Origin Discovered:
  • The Manufacturer: This specific numbering sequence and multi-track format conclusively map back to DUX (Markes & Co.), a major mid-century toy brand based in Lüdenscheid, West Germany.
  • The Tracks: In the DUX catalog, the 42xx series was reserved for classic German children's folksongs and lullabies. A 4230 stamp indicates that this side features a timeless standard melody—most likely "Macht auf das Tor" (Open the Gate) or a highly similar traditional melody like "Es tanzt ein Bi-Ba-Butzemann."
  • The Toy Player: This disc belongs to a DUX Auto-Phon or DUX Musikboxfrom the late 1960s or 1970s. These toy players featured a hand-crank or battery-operated turntable. Instead of a standard phonograph needle, they used a small wide-lipped slider that you would manually align with either track "Side 1" or "Side 2" on the same surface to pluck the internal music notes.
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