It is difficult to comment on the authenticity of this particular clock, based on the limited photos, but the white dial, with 24 hour indication, was a legitimate version madee by Heuer.

Have a look here to see photos of another sample of this type of clock -- http://www.onthedash.com/watch/24-hour-master-time/

Notice that the case is black, rather than the usual chrome.

Jeff

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: PLEASE SOMEBODY WITH KNOWLEDGE??