No way to know without trying.
@ 30 yrs
The High Standard model is a Supermatic citation- none of my references show them as being made in stainless steel. There are High Standard pistols made swith an Electroless Nickel finish. Not extremely common nor extremely rare.
Hi-Standard made multiple models of pistols. Some had slide locks.
Depends on model (and there are DOZENS of models of High Standard pistols) and the condition.
Blue Book of Gun Values
Need serial number to answer. All High Standard pistols followed a continuous serial number sequence.
Jim Spacek has a book out that should fit the bill.
The original company was based in Hamden, Connecticut. The company which currently bears the name is based in Houston, Texas.
There are more than a dozen DIFFERENT High Standard .22 pistols (and a coupe of revolvers). Some have a fairly high colelctor's value. Without a complete description (make model and condition) we really can't guess.
James Spacek wrote a book called "Hi-Standard Pistols & Revolvers 1951-1984" that will have information.
1957 is a best estimate. Serial number data is still being gathered by collectors.