Details:

Although more than 40 years old, this machine is in near mint condition and works perfectly for all functions. The rather low serial number might indicate that this calculator is a very early one.  
It uses 17 vacuum fluorescent tubes to form the display.  The left most tube contains a  memory-in-use  indicator for memory  I and  II. The next tube contains the overflow/ error indicator.  
The high quality keyboard uses reed relays which were often used those days.  When a key is pressed it moves a magnet along the reed relays thereby closing its contact.

Usage:

Addition, Subtraction, Multiplication and Division:

 Work as usual today.  There are two memories:  I and II.   The “M+” and “M-” keys operate in these memories.

Function of other keys, switches etc.:

• The 1st press of “C” only clears the input register. The next press clears the machine except for memory  I and II.
• “MR” puts the memory contents back in the input register. “CM” clears the memory.
• Constant: A number entered stays in the input register until a new number is entered.  I.e. 12x12x12  can be calculated by entering 12, followed by “X”, “=”, “=”.
• “%” and “/%” supports percentage calculations. Examples:

1. 120 “%” 10 = 12        (12 = 10% of 120)
2. 120 “/%” 10 = 1200   (120 = 10% of 1200)

• “DP” followed by a digit key or the comma determine the number of digits after the comma.  For example: “DP” followed bij the comma-key result in 10 digits after the comma.
• Memory switch:
  0 :  no automatic memory action
  A: Calculation results are added in memory II
  B: The first operand is stored in memory I
  C: Combination of A and B
  D: When using M+ and M- for memory I  the number of these operations are counted in memory II
• 5/4 switch:
  Upper position:  round upward
  Centre position:  rounding as usual
  Lower position:  digits are truncated at the with “DP” selected point

Click to view a full size picture (opens in a new tab)

Serial number:

Built in:

Functions:

Market-introduction:

Production until:

Price:

001170

1976 ?  by  Orgtechnika

Addition, Subtraction, Multiplication,  Division, Square Root, Percentage Calculations

1976 ?  (My machine contains  some IC’s with prints indicating 1976 as year of production)

 ?

No prices found.  However in 1976 machines with one memory and 12 digit display were priced between DM 70 and 150.  This beauty might well be close to  DM 150.