Yes by case number I mean reference number. The number on the one you show wont be an Omega case number or serial, it is internal to Dennison (who have been defunct for decades). On post war models there is usually a Dennison model number and a serial number stamped in the caseback. I am not certain which that is, probably just a serial number which will be useless for identification. Usually Dennison stamp the last 3 digits of the serial (not model) onto the movement spacer or case. You can just see it on the pics above.
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