Galvanized or cooper?

Year built is 1956, there was some visible
plumbing that was updated to PEX and other to cpvc, but my question is regarding the pictures below. It seems like cooper but I have never seen cooper threaded that way, so can it be galvanized ? My other thought is that it may just be a cooper or brass nipple connected to galvanized behind walls, any thought on this ?

There are threaded copper fittings that are soldered to the pipe that allow for those types of connections.

Brass nipple.

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I’m with, Scott.

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Brass :+1:t2:

https://www.nytimes.com/1998/04/05/nyregion/home-repair-fixing-and-modifying-threaded-water-pipe.html

Thanks for the response guys great help :+1:t3: And thank you @jjonas for the article good read

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