MASON  Mod. A2
Spy Radio Receiver  with Spectrum Analyzer
Year  1965
Manufacturer MASON ENGR. CONN. USA

I m interest to find the manual.

The system Mod.A2 is a portable, battery operated, miniature, modular radio receiver consisting of a basic unit with plug-in tuner modules.
The radio receiver has the spectrum analyzer included. This spy radio receiver operates from 2KHz to 2.0 GHz. Decodes AM, FM and CW signals.
 

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The A2 system consists of the following modules:

Rceiver Model A2

Visual Display Unit Model S1

Rechargeable Battery Pack Model BP3

AC Power Supply Model PS2 95-128-170-250 VAC

3 Antennas

12 Tuning Modules:
   TLF-1 2-9 KHz
   TLF-2 9-43 KHz
   TLF-3 43-130 KHz
   TLF-4 130-475 KHz
   TLF-5 475-1475 KHz
   TLF-6 1.47-4.5 MHz
   T-18 4.5 – 18 MHz
   T-75 18 -75 MHz
   T-340 75 – 340 MHz
   T-650 340 – 650 MHz
   T-1200 650 – 1.200 MHz
   T-2000 1200 – 2.000 MHz :