Single Barrel -top single or Unsingle. If an unsingle, a NEW inexpensive (not flying version) Negrini is the universal 1603i case. We sell lots of these -Black or Blue. If it is a top single, then its OK, but keep some of the foam in the case to hold the barrel in place.
Have a couple of older Perazzi case, was going to send them in to get redone as the foam has started to crumble. You can PM me for sale price on either.