I agree with Ed.
Those involved in the inbound trade of these blades would be to some degree literate and have an understanding that these are white man’s words and thus perhaps be considered to have power over them and have no real place amongst the regions who received these blades.
The blades with symbols from guilds could be presented as votive ad talismanic in a more primal sense.
As far as German vs. Spanish, with German centres being very productive and being cheaper to make and seeing the volumes of German blades worldwide, they really had a handle on this and no doubt a massive income from it...the Spanish would not have been as competitive until the water wheels started stamping out blades en masse but by this time I think the trade blade distribution had seen the horse already bolt andopportunity missed.
Gavin