Science-fiction book cover: "Invaders from Rigel"

• Title: Invaders from Rigel
• Cover blurb: "A Science-Fiction tale of a community that had miraculously changed to metal."
• Cover typography: Fairly boring
• Author: Fletcher Pratt (1897-1956)
• Cover illustrator: Unknown
• Publisher: Airmont Books (SF-4)
• Book's first publication: 1960 (though it is an expansion of a magazine novella first written in the early 1930s)
• Date of this edition: 1976 (Airmont published four editions of this book between 1964 and 1976, with the price starting at 40 cents, rising to 60 cents for the second and third editions, and then peaking at 95 cents for this one. Source: www.isfdb.org)
• Price: 95 cents
• Pages: 127
• Format: Paperback
• Back-cover blurb excerpt: "But Murray Lee woke up with a feeling of overpowering stiffness in every muscle. He turned over in bed and felt his left elbow, which seemed to be aching particularly — and received the shock of his life. The motion was attended by a creaking clang, and his elbow felt like a complex wheel. Why — he was metal all over!"
• Silliness Level of that: 8.5 out of 10.
• First sentence: Murray Lee woke abruptly, the memory of the sound that had roused him drumming at the back of his head, though his conscious mind had been beyond its ambit.
• Right. What's an ambit? Merriam-Webster defines ambit as "the bounds or limits of a place or district" or "a sphere of action, expression, or influence."
• Last paragraph: "Ho hum," said Ben Ruby. "The dictator of New York seems to be de trop. How does one get out of here?"
• Random sentence from middle: The white knight, he wrote in a fit of impish perversity, is climbing up the poker.
• Goodreads rating: 2.86 stars out of 5.
• Excerpt of nice review from Amazon.com, written in 2009 by Raymond Mathiesen: "Right from the start of this novel Fletcher Pratt writes with a cheery, devil-may-care attitude that reveals that he has his tongue firmly wedged in his cheek. The book is filled with absurd circumstance, snappy dialogue and incredulous plot twists. The 'science' in the story is so weird that it can't tolerate a moment's serious analysis. Pratt has written a good-natured parody of the type of stories written in the 'Golden Age' of science fiction (1930's to 1950's). The ray guns, strange, malevolent aliens and super-fast flying-craft are all there, but with a mock serious aura. The story is closer to true fantasy, and interestingly Pratt had previously published seven fantasy novels, most of them with a humorous bent."