Uncommon on the K22 in the satin era to about 1955. So it's right on the cusp.

Could be factory Bright blue finish special ordered. If so it will have an extra large B following the serial # under the barrel. And an historical letter will confirm.

If no large B it was made after the bright blue finish became standard again.

Both of those contingent upon it still having its factory finish as you posted.

__________________
Jim
S&WCA #819