I don't know the model but White as a brand name is still being made. I took a look at one of their sergers when at the thread injector shop earlier this week.
White's now under the Singer umbrella now. In all likelihood, you can go to Singer's web site and download or buy a manual for it once you know the model.
http://www.singerco.com/accessories/manuals.html
If Singer doesn't have it for free, check these links:
http://www.managemylife.com/mmh/owner_manuals
http://www.hammerwall.com/
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