Here you go:
Dawn Vices
Go to DOWNLOADS (top right corner)
Then go to HISTORY (in drop down menu)
1st link (1917 -1967 cat) has your vice on pdf page 7 which is page 13 of actual catalogue.
Ooops, link takes you right to downloads so look for:
1917 to 1967 DAWN and JAN Products For The Workshop Golden Anniversary Issue
PS, I have a similar vice but made earlier in UK. It is my #1
go to vice (and I have around 25 vises). The Dawn has a jaw improvement over mine. I'd love that vice!