I have not seen one of these for decades. In fact I had forgotten all about them. The last time I saw one in use was when I was a young boy. I've tried to recall where it may have been but could not with any assurance. Most likely it was at a repair shop or shoe repair store.
It is a register or till if you prefer. Notice the hand crank in the shadow to the left. You turn it and a receipt would roll into place where the blue square is on top. That blue is carbon paper. The receipt on top usually was yellow and the store owner would write out what you purchased or the service he performed on the yellow receipt. He would rip off the yellow original which was for the customer and his copy (usually white paper) made by the carbon paper would roll up within the machine as he cranked up a new receipt for the next customer. At the end of the day he'd unlock the top and remove his copies of the day's transactions.
Now how many of you were familiar with these machines?