Sorry, I wasn't clear on when the valve was put it but our house was actually built in 1927. I believe it could have been installed sometime in the 50's.
Wifes family bought home in 1969.

The valve body IS cast Iron and buried in concrete, so i cant replace the sucker without great efforts and difficulty or $$$. Thankfully all parts are available, although a few parts are big heavy machined expensive brass, crossing my fingers.

Jerry, I will probably end up getting the parts and either doing it myself or hiring someone with personal experience to do it.

What i cant figure out is, why is it set so deep?? The top plate of the valve body is about 50 inches below grade, does that sound right?

my big problem is trying to figure out what to do about the sewer water standing in the pit... when i pull it out with a wet dry vac, more comes up.

I am going to have a hell of a time replacing those parts underwater.