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The key number for the original lock should be between A1051 through A1299. If the lock cylinder is tight, a new key will not help. I would not recommend using a fish oil based lubricant such as WD40 or Kroil as they may cause the lock to swell even more. Lock Ease is a liquid graphite product that I have found to be a better alternative.
Even though these handles supposedly have a non-removable lock, the locks can still be removed by disassembling the handle. The locks are then fairly easy to re-key. The number you provided will not correspond to code books. Replacement keys are easy to obtain, replacement locks are not so be careful when removing. If you need more help, please call me.