CT1 is a high heart, CT2 is low, CT6 and CT12 are standard.
I think belgian cut only belongs on a cello
We use to have a stash of NOS Tellers with a 155mm width, the Despiaus standard widths are 150, 158, 165 so that 155 was useful on some basses. I found I had to do extra work on the Tellers...