Is this cassette rare given it's self-released?

Yes, as it was self-released in 2004 with no official label, it possesses a unique, independent rarity factor.

What is the format of this album?

The album is available in the cassette format.

The item is listed as "Not On Label" as it was self-released.

Name: Separate – Black Book (Cassette, Album)
Brand: Separate

Hip Hop

What Black Book by Separate is worth on the used market.

Label · Not On Label (Separate Self-released)Format · Cassette, AlbumGenre · Hip Hop

Used

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New / Sealed

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Price data verified against · 1

Black Book by Separate (2004) on Cassette, Album. The Discogs marketplace floor is null with 0 copies currently for sale.

Pressing, country, and condition (media + sleeve) move vinyl/CD values the most — first pressings and clean copies command a premium.

Is this cassette rare given it's self-released?: Yes, as it was self-released in 2004 with no official label, it possesses a unique, independent rarity factor.
What is the format of this album?: The album is available in the cassette format.
Is there any information on the original label?: The item is listed as "Not On Label" as it was self-released.