It seems Cash Registers don't attract the same level of 'rivet counters' that you find in the world of vintage typewriters. I guess they just don't have the same romantic connotations. Which is rather unfair, as they are marvels of engineering, and fairly impressive design wise. This is the early 'Crank Handle' type, and without wanting to sound too Shylock (a Shakespeare reference, no offence intended) about the whole thing, it really does make a marvellous noise when used, a smooth action, with an oh so discrete bell.
In the (not) unlikely event that anyone reading this has an interest in Regna Cash Registers I found this site for the photographs, and this to be helpful, though Google Translate has it's limitations!.