No, those resistors have drifted since their original construction. People did have ohm-meters back then and would verify values on resistors particularly if they were colour deficient or colour blind as I did, testing Rs when building kits - red/green deficient vision. I still check almost all resistors I come across with a meter as I don't trust my green, dark red, and brown differentiation.
If they are in power circuits - plate or cathode or voltage dropping then those do drift as they were only compressed carbon and heat/cooling cycles would cause them to change value - usually upwards as you have discovered. I consider your values typical of tube gear that is 40 or more years old.
1920s resistors were a chunk of carbon rod with a wire wrapped around each end then dipped in a sealant - how long do you think that value would last within X%? Wire wound resistors external connections were pressure bonded to the resistance wire, not uncommon for that joint to fail over time...Like I said earlier you HAVE to verify all the resistors as they wander over time. Modern Rs are much more reliable when operated under their rated wattage.
John :-#)#