the name on the action is unimportant, could be simson, haenel, sauer&sohn, jagdwaffenwerk, bühag with or without the name of one of the smaller firms. all action were basically the same no matter how fine the engraving was latter. most of them and especially the shotguns dont having firing pin bushings.
this is another question. its not possible to show you the way to find such an action without looking into the company documents.

its only that all shotgun action actions in this time frame were the same like the actions used for combination guns and double guns so the action and the locking mechanism is able to deal with rifle cartridge pressure. that was told me by someone who know more about this.