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

Yes, as it is Obtest Self-released and has 0 copies currently for sale, it is considered a rare find.

What is the format and release year of this music?

The music is on a Cassette in a Single Sided format, released in 1995.

This track falls under the Rock genre.

Name: Obtest – Oldness Comming (Cassette, Single Sided)
Brand: Obtest

Rock

What Oldness Comming by Obtest is worth on the used market.

Label · Not On Label (Obtest Self-released)Format · Cassette, Single SidedGenre · Rock

Used

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New / Sealed

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Price data verified against · 1

Oldness Comming by Obtest (1995) on Cassette, Single Sided. 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 since it's self-released?: Yes, as it is Obtest Self-released and has 0 copies currently for sale, it is considered a rare find.
What is the format and release year of this music?: The music is on a Cassette in a Single Sided format, released in 1995.
What genre does "Oldness Comming" belong to?: This track falls under the Rock genre.