Looking for information on a dawn quick release engineering vice

[MWF FEED]

Hi I have a Dawn Engineering vice and the interesting thing about it is it is quick release which I have never seen before. Seems to be 3 1/4 inches
Anyone know much about them?
IMG_20190306_162204116.jpg (http://metalworkforums.com/attachment.php?attachmentid=378342&d=1551850146)IMG_20190306_162159366.jpg (http://metalworkforums.com/attachment.php?attachmentid=378343&d=1551850183)IMG_20190306_162224333.jpg (http://metalworkforums.com/attachment.php?attachmentid=378344&d=1551850206)

regards
Mike
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http://metalworkforums.com/images/attach/jpg.gif IMG_20190306_162159366.jpg (http://metalworkforums.com/attachment.php?attachmentid=378343&d=1551850183) (257.5 KB)
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