Thanks for the comments.
Since there don’t seem to be as collectible as I thought, I could just buy them to make some profit.
The seller is asking €1100 for both of them.
I’ll sleep on it.
Again, thanks so much!

I am afraid that is all I have in terms of photos and info.
Any chance that we determine the value and date of the instruments?

And this is the newer one:

Greetings to the members of the forum. My name is Haris and this is my first post. I'm an amateur collector of musical instruments and a seller near me is selling two Miraphone tubas; a vintage one Bb (from the 60s or 70s) and a newer one Eb. I am attaching photos. Any info on the date of the tubas ...