Reloadable shotshell identification wanted

This reloadable shotshell in 12 gauge seems to have been made at Sevilla by an unknown (to me) manufacturer.

The case is very heavy, with thick walls, but I couldn’t say if it was made from a brass bar or by drawing a brass cup. It measures 54.5 mm.

The headstamp reads (C P.P.T 12 SEVILLA).

The Palencia factory of the Santa B