The Linguaphone Conversational Course English: For sale

Hello,

I have a set of the original Linguaphone English course that I want to sell. Tolkien recorded 2 of the stories (20 and 30: "At the Tobacconists" & "Wireless"). These should be the first recordings of his voice.
The set is in optimal condition, and seems almost unused.

One of the books is dated 1931, second edition. Since the sets have been sold between 1929 and 1940's, I believe these records must be also about 1931. No idea where i can find this for dating the set...

The set is complete with all booklets (see pictures) and the original letter for the order at 1200 Belgian Franks. The set was bought by my great grandfather (Dr. De Jaegher).

Is anyone interested in this set? On the website tolkienlibrary.com you can find incomplete sets at about €600. Are there people with honest interest in this set? If so, you can make an offer on this. If no interest shows up, I will try to find a proper auction platform to sell it to collectioners.

Kind regards,
Sebastian

PS uploading pictures doesn't seem to work. I will try to do this in a separate post. If not, you can receive pictures with details through mail.

Trotter edit added pictures