Very nice 5 screw wide rib K22 Masterpiece!
The new style wide rib barrel was changed when S&W weight matched the 3 different caliber 6" Masterpiece revolvers ,
Although the 1950 All Models Circular (AMC) just says K22 Masterpiece.
Prior to that all 3 caliber Masterpiece revolvers had the same profile barrel with same narrow rib .
The older narrow rib guns frames have a chamfer so they mate to that narrow rib barrel where your "Wide rib" gun has a sqaured frame top strap where it mates to the barrel.
The K38 Masterpiece barrel rib is even wider and does not taper adding some weight to compensate for the larger cylinder bores ,
While the early wide rib K38 was referred to as the K38 "Heavy Masterpiece" in the 1950 AMC to help differentiate it from the older narrow rib version as they were both being sold at the same time the K22 did not get a new name as the tapered version was discontinued when the new wider rib version replaced it in 1955.
You will notice below the .32 and .38 Heavy Masterpiece says " Matched for weight with K22" the older version says "Matched for size".
Your serial is fairly low for a wide rib K22 and IIRC they appear around 1955,
By then the high polish "Bright Blue" finish was standard so we do not see wide rib guns in satin blue ,
Another interesting factoid is the 5 screw wide rib K22 did not have a particularly long run as IIRC the 4 screw K22 Masterpiece appears right around 1957 near K278,000 (ish?) range.