The term 'cartel' is never used when describing antique musical boxes.
The word is a modern invention used to imply or describe an 'up market'
box, and as such is not really necessary.

Most modern musical boxes use a spring-barrel orientated such that the
spring axis is at right angles to the base plate, i.e., sticking up.
The drive is through a bevel gear and thence to conventional spur gears
on to the cylinder.  The winder is underneath the case.

Some manufacturers use the Cartel label to describe their larger and
more costly products where they follow the antique musical box layout.
Here the spring barrel axis is horizontal, i.e., parallel to the
cylinder.  The winder may even be a ratchet lever, again like a
traditional musical box.

As with everything, you get what you pay for.  The term Cartel, when
used to describe a modern box, just tells you what you already know
from the price.  No knowledgeable person will ever use the term Cartel
when describing an antique musical box.

Best regards,
Nicholas Simons, GB