Media Condition: Near Mint (NM or M-)
Sleeve Condition: Very Good Plus (VG+)

Sleeve has ring marks but otherwise very nice
 

Notes:

Label notes:
Made in England
United Artists Music Ltd. / Jet Music 
℗ 1977 United Artists Music and Records Group Inc.
[A-Side Taken from the Album 'Out Of The Blue' -- UAR 100
[B-Side Taken from the Album 'Face The Music' -- UAG 30034

Sleeve notes:
G&L
UP36342
Marketed by UA Records Ltd

Release notes:
Also available with a push-out centre, a large center hole and on black vinyl.
Track durations do not appear on the release.
The rear of the sleeve bears extensive details on how to purchase, and for how much, ELO merchandise. 

The difference between this A-side and the "Out Of The Blue" album version is that the 5 seconds of the sound of the tuning radio at the beginning is missing. Pretty minor difference, but it does seem to turn up on a lot of compilations. NB. The US 7" is a much shorter edit lacking the orchestral coda.

The difference between the B-side and the "Face The Music" version is that it's missing approx. 55 seconds of the orchestral intro. All the female backing vocals are missing and the song fades early. It appears to be the version of the song before the overdubs at Record Plant Studios in New York City. 

Detailed confirmation of these differences can be found at 

Runouts are etched.

A. Mr. Blue Sky 5:01
B. One Summer Dream 4:25

Barcode and Other Identifiers:

Matrix / Runout UP 36342A
Matrix / Runout UP 36342B
Matrix / Runout UP 36342-A1 ALLEN AI
Matrix / Runout UP 36342-B1 ALLEN AJ
Matrix / Runout UP 36342-A1 ALLEN AG
Matrix / Runout UP 36342-B1 ALLEN AM
Matrix / Runout UP 36342-A1 ALLEN AA
Matrix / Runout UP 36342-B1 ALLEN AH
Matrix / Runout UP 36342-A1 ALLEN
Matrix / Runout UP 36342-B1 ALLEN
Matrix / Runout UP 36342-A1 ALLEN B
Matrix / Runout UP 36342-B1 ALLEN C
Matrix / Runout UP 36342-A1 3 Allen F(D)
Matrix / Runout UP 36342-B1 Allen FX(D)
Matrix / Runout UP 36342-A1 3 Allen A(D)
Matrix / Runout UP 36342-B1 Allen AB
Matrix / Runout UP 36342-A1 1 ALLEN D
Matrix / Runout UP 36342-B1 1 ALLEN E
Matrix / Runout UP 36342-A1 ALLEN Y
Matrix / Runout UP 36342-B1 - ALLEN AD

Phonographic Copyright (p) United Artists Music And Records Group, Inc.
Published By United Artists Music Ltd.
Published By Jet Music
Lacquer Cut At CBS Studios, London
Printed By Garrod & Lofthouse
Marketed By United Artists Records Ltd.