Hi Detlef,
also congrats with this nice piece. Though -I know you always like to etch everything, but this piece has such a lovely old patine! If you etch it that will be gone forever!
Ofcourse its your piece but 'in the name of all nice 19th cent. blades' hope you'l think twice before dipping it into hot acid/vinegar.
Seems like your getting a quite nice Moluc/Philippine collection together! Interesting (unique?) combination!
Greets