Is this a rare item for blues collectors?

Yes, as a 1984 Chess compilation on cassette, it holds niche appeal for vintage blues collectors.

What format is this sampler in?

This "Various – Chess Masters Sampler" is available in the cassette compilation format.

The compilation was originally released in 1984 under the Chess label.

Name: Various – Chess Masters Sampler (Cassette, Compilation)
Brand: Various

Blues

What Chess Masters Sampler by Various is worth on the used market.

Label · ChessFormat · Cassette, CompilationGenre · Blues

Used

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New / Sealed

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Price data verified against · 1

Chess Masters Sampler by Various (1984) on Cassette, Compilation. 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 a rare item for blues collectors?: Yes, as a 1984 Chess compilation on cassette, it holds niche appeal for vintage blues collectors.
What format is this sampler in?: This "Various – Chess Masters Sampler" is available in the cassette compilation format.
What is the original release year?: The compilation was originally released in 1984 under the Chess label.