Emphyrio

Run the Doubleday club tells: "Book Club Edition" printed at the foot of the front jacket flap, no price on the jacket, a five-digit code on the jacket's back panel, a small blind stamp (square, dot, circle, triangle or maple leaf) debossed into the lower rear board near the spine, thinner bulk on cheaper paper, and boards sometimes covered in paper rather than cloth. The trap that catches buyers is that Doubleday book-club copies can carry over the trade copyright page — including the "First Edition" line — so the statement alone never settles it; the jacket flap and rear board decide. No separate Science Fiction Book Club printing of Emphyrio surfaced in the sources consulted, but any copy showing the tells above is not the trade first regardless.