Infoseeker
Headphoneus Supremus
I don’t know if it is important or not - in the photo it's my headphones
Interesting how it is Ej07-003. For mine it is Ej07-005.
So I guess the right number isn't a model number, but production unit number. I got the 5th one made and yours is the third.
And the St7 does not begin with EJ07.
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