screw guage copper piping

My place 1950 ish had screw guage copper installed must be 3/4" it has thick walls when you cut the stuff. Is this stuff still used? I need to do some plumbing down the track and wondering what to do, install new stuff, as you know the price of copper is it worth taking this to the scrap metal or is it of more value to some one else?

The reason I ask is I will take out approx 30 lm that gives me a tap down my back yard that I dont use to start with.


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