I believe (actually, it's more like an semi-educated guess) that the 110 indicates that it is a drop-belt for a buscadero type rig, the "M" indicates medium size and the C38 indicates .38 caliber belt loops. On the other hand, I've had my beliefs shattered in the past and I'm prepared to have them shattered again. When that occurs, I'll just say that I was following Coffinmaker's lead and offering no useful information. Go ahead and ignore me too.
CC Griff