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Bruce, without knowing what company this sign came from, it's difficult to pinpoint things like this. There are many manufacturers and most have their own way of making these.
Google 'hospital signage' or 'wayfinding signs' or even ' ada signs'. Many of these companies deal in all types of hospital signs.
You can also do: www.ada-advantage.com or: Charleston Industries or: Scott Sign Systems
posted
That looks identical to a Howard Industries model. I would start there because they have a couple with a convex front which looks just like your picture. Go to their website, then the interior signs link then look at both their directional and their directory pages.