Most likely brass Michael, but you have it in your hand, and by the look of things you have at least as much metallurgical knowledge as I do, so I reckon your guess would be probably better than mine.
Put it this way:- they use gold, silver, mamas, brass. I'll put money on it that the fittings (brongsong, sopal) are not gold or silver, mamas is unlikely, the fittings look too recent and mamas does not emboss well, so brass is most likely.
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