See new pics.
It would be coincidental that the pressure rating 850 PSI @ 73 degrees F matches PVC rating.
… and the notation SCHED 80.
Plastic Coated Galvanized steel potable domestic water supply pipes. Flag it.
Refer to a likened plumber for further evaluation
PS: Welcome to the community.
You sound definitive about this, and I posted because I want to tap into the minds of those who know more about this than I do, but I can’t find anything through Google when I search plastic coated galvanized pipe, …no images nothing that tells me anything; although, I did find a company in China that purports to sell it. What leads you to this conclusion? Any link that I might follow that would lead me to comfort informing a client. I very much appreciate you sharing your knowledge, and your designation adds to your credibility, but I’m hoping to see something that would back up the assertion.
Me too 
I also found this: https://www.corr-tech.com/EG-section1.pdf just now (not sure why I didn’t see it last night) and in it saw, “PS 21 PVC plastic pipe (Schedules 40, 80, 120)
supersedes CS 207-60” which would seem to indicate PVC
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CS stands for commercial standard. CS 207-60 has been withdrawn. And it applies to PVC.
It’s way down this list in chronological order.
Threaded pipe and pipe fittings.
Corrosion on the interior wall in one of your images of a dead leg and shutoff valve.
SOHED 80 Schedule 80 Steel Pipe Sizes and Dimensions ANSI seamless Steel pipe.
Please, do not take my word for it.
I admit it does look like corrosion on the inside of that pipe. I wish that I had had the foresight to run my finger over it. I believe that it was dirt. The basement was pretty grubby, and condensation over everything attracted any dust or dirt in the air.
I appreciate all of the input that I received here. I know that you all have better things to do, so you should know that I am quite grateful.
With the necessity of issuing the report in a timely manner, I called out the piping as PVC - not suitable for use with potable water inside the home. Reading in another thread on this site, someone postulated that the reason for this (given that PVC can be used for potable water outside the home) is that it’s hard/impossible for a building inspector to determine which pipes are for hot water and which are for cold; therefore, since PVC isn’t suitable for hot, it’s easier to just disallow it.
I used lots of weasel words like “appeared to be,” and left open the possibility that it is CPVC (which I now tend to doubt). I flagged it as a significant concern, and suggested further evaluation by a licensed plumber. While there is some evidence for the plastic covered galvanized theory, I’m not entirely persuaded. Mostly, the PSI rating seems to me to indicate PVC (or possibly CPVC). Additionally, the notation CS207-60 seems to indicate PVC. Thanks again for the help to everyone who participated!
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