On Wed, Mar 28, 2012 at 2:42 PM, Tony Duell <ard at
p850ug1.demon.co.uk> wrote:
  I asusme it's not just a flat disk of glass
(which is what most UK wall
 clocks from Smiths, Gents, etc use). 
 Definitely a curved glass "bowl."  I've never worked with glass myself
 but it will definitely be more akin to casting a new car windshield
 than just cutting plate.
  A fair number of clock parts (for much older
clocks) are either being
 remanufacutred or made-to-order. You may well find a company that maks
 glasses for clocks whoc could make soemthing for this unit. Be warned it
 will not be cheap! 
 Yeah, so I figured.  My best bet is to find a trashed IBM clock as a
 glass donor. 
A quick look at Google with "clock" "glass" "replacement"
tells me that
replacement curved glass is neither hard to find nor expensive.  Here are
some that look good:
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