Actually 600k was a standard value of resistance. The E series of resistance is the EIA values that weren't adopted until 1952. Prior to that resistors had values like 400k, 500k, 600k,etc. Have a look at an early Allied or other distributor catalogue. Same applied to early capacitors. Old values of 0.02 & 0.05 became 0.022 & 0.047, etc.
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