The Escort 5M7 was manufactured for McKenzie & Willis by Akrad Radio Corporation Ltd in 1947.

Available in 2 different cabinets named the Invincible and Everest. 

Akrad 5M7 Everest & Invincible

A failed attempt on Everest was made in early 1947, could this be the origin of these two names?

Valves (5): 6K8GT, 6SK7, 6Q7GT, 6V6GT, 6X5GT

Intermediate Frequency: 465kc/s

Chassis Notes (most schematics can be clicked to download a full size version): This chassis was sold in radios under several different Akrad-manufactured brands - Escort, Pacific, Regent, etc

1947 Escort 5M7

1947 Escort 5M7

General Construction Notes for Akrad Radio Corporation Ltd:

Akrad sets often consist of 3 (or 4) numbers (eg: 518, 1059) or number-letter-number (5M4), and a common pattern exists for these sets: The first digit(or 2 digits in the case of 10-or-more valves) is the number of valves, the second is the number of bands and the third is the last digit of the year. Where the middle digit is a letter rather than a number it generally refers to the type of set - M for mantle, P for portable, G from radiogram etc

Often sets can be dated by the speaker, as many Akrad sets from the Pye era have the date of manufacture stamped on the back of the magnet housing.