A simple LED display scientific RPN calculator made by National semiconductors. This calculator is not programmable and has no exponential mode, it can also not display in exponential notation.
A remarkable feature of this calculator is the M+x^{2} function printed below the MS key. Some examples in the manual demonstrate the benefit of this function for adding the square of the number to calculate the area of a cone and for conversion from rectangle coordinates to polar coordinates.
Serial number: 144657 

This backside label shows some short instructions for this RPN calculator.  
The other backside label tells that the NOVUS is a product of National Semiconductor Corporation. 
The pouch of this Novus calculator looks familiar with the pouches of the HP calculators. The quality looks is very nice with a large zipper and an embossed logo. 
The user manual can be downloaded here.