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Resistors with the standard color code will have a last color band that is silver (10% tolerance) or gold (5% tolerance). I can't recall if no band means 20%. By the time I started in 1966, even places like Motorola consumer were using 10%, and better places like Zenith were regularly using 5% parts. So, 227K vs. 220K is just fine. Many circuits were built with 10% resistors unless it was found that 5% was really needed to prevent rejects in final test. Anything requiring closer tolerance than 5% usually meant you put an adjustable control in the circuit. On top of that, the carbon composition resistors varied in manufacturing such that 5% parts would be selected out of the batch, leaving 10% parts that were either high or low, but never nominal.
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