The Murphy MB302 was manufactured for Fisher & Paykel Ltd by Allied Industries Ltd (Fisher & Paykel) in 1957.
6 valve + eye bandspread set

Technical Information

Valves (6 + eye): EF85, 6C9, EF41, EBC41, EL41, EZ40 and EM81 or EM85 Magic Eye

Intermediate Frequency: 470kc/s

Frequency Bands: 8

Chassis Notes(most schematics can be clicked to download a full size version) Bandspread set: 6 bandspread bands + SW + BC (and both tape and gram input). Two different eye options - EM81 or EM85 - must replace like with like or rewire to suit.

1957 Murphy MB302

Service information (Murphy_MB302_Metroploitan_-_6V_BS_AC_-_1957.pdf) here

General Construction Notes for Allied Industries Ltd (Fisher & Paykel):

Murphy stereogram model prefix indicates radio bands - ie: SGA is Stereogram All-Wave, SGD is Stereogram Dual-Wave. SG means Stereo broadcast band radio only (stereo referring to the record player - radio was only mono. Dashes and spaces seem to be used in some places while not others - ie: SG1387 is the same as SG 13-87

Dating Murphy equipment is a little difficult due the codes not appearing to contain dating info.  Here is what can be seen from the models examined:

SGx61x (ie SG615, SGD618) radiograms seem to have run from 1959 through until 1961/62 and used Garrard Type A record changers (these were released approximately 1959)

The first digit or digits seems to reflect the number of active devices (ie: SG 14-32 has 14 transistors, SG615 has 6 valves)