Back when the cars were "used cars", what is now termed "reconditioning" is all that was usually done. It was very seldom that a new cyl was installed.
With the car on the lift and the wheels removed to do the brake linings, the cyls were disassembled in a few seconds, the brake cyl hone was put onto an electric drill, some brake fluid was splashed into the cyl bore, and the cyl was honed for several passes, washed out with brake fluid, and then a few more passes of the hone for final clean-up. Then the cyl was again washed out with brake fluid, wiped with a red shop towel, and the new stuff was installed. Quick and easy. The mechanic's skill and knowledge of when the inner bore might be worn too much to hone, might have been important, too. But in those days, a car might need only one or two brake jobs per owner, which could easily span well more than 100K miles.
Maybe a little sloppy, depending upon how it was done, but it worked well for ages. In current "haz-mat" times, a pan with paper towels would be needed under the wheel cyl as it was cleaned to catch the liquid and such. And, of course, after the job was finished, bleeding the brakes was necessary!
In more current and seemingly affluent times, it can be less expensive to replace than repair. Knowing the source of the new parts might well be important, as in "USA Name Brand" parts to mimic what was originall, too.y on the cars when new.
Kind of funny how things tended to work back then. Every gas station usually had an open gallion of brake fluid with a bulb to extract it and install in a customer's master cyl, with NO issues. Now, it needs to be kept in a tightly-closed container to prevent it from absorbing moisture. But that was also back when "sex was dirty" and the air was cleaner (in some places), too.
IF the innards of that wheel cyl look like pictured, think what the lines might look like too! When you get it all cleaned up, check the inner bore with an electronic inside/outside caliper to see where things are.
But everybody tends to like "new" these days and "new" is readily available, so that might be one issue to consider. Then seek out the "new" items sourced from the USA, if possible.
Just some thoughts,