Vintage LION Auto Numbering Machine, Stamper, Model C-71  (HG-A168)
 
Here is a vintage automatic numbering machine, also known as a paging stamp or number stamp, which is a device used for sequential numbering of documents. It is a "Lion Pro-Line Heavy-Duty 6-Wheel Automatic Numbering Machine". 
Construction: It features a robust metal construction, ensuring durability for frequent use. 
Numbering Mechanism: The machine utilizes multiple numbering wheels (in this case, 6 wheels are visible) that automatically advance to the next number after each impression, facilitating sequential numbering. 
Handle and Operation: It has a handle, often with an ergonomic design for comfortable operation, which is pressed down to make an imprint. Instructions in the image indicate how to change figures by pressing the handle and adjusting the desired position. 
Applications: These machines are commonly used in various professional settings, such as banking, medicine, accounting, and offices, for tasks like document identification, date and number stamping, serial numbering, and indexing. 
Condition - Used but operates correctly. The ink bottle may be dried out.