This is probably a custom font/lettering of the clock manufacturer.
You could try to use a similar font like 3x5 by K-Type (free for personal use).
If you make it a bit bold (to hide the intermediate lines) and modify |1| & |2| I think it will be close enough.

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I found it using Find my Font - http://www.findmyfont.com

Thank you! Your info gave me the closest match to the original. I have been getting font-mares trying to find the right font.

How about this: http://www.identifont.com/show?LHJ

I first tried Bank Gothic (and variants) but the 6 was very different.

I'd like to add to these suggestions Stratum, Register (reworking some finials and crossbars), Bourgeois, Route 66 (probably the closest I have, /4 has even the left cut), Mandatory

Eurostile

You guys are awsome! I appreciate all the help making a new clock face an accurate representation of the original.