not sure how old it is because i'm not a Parker vise expert, but if i had to guess i'd say 1920's or 1930's made.
i have a few of the other maker's swivel jaw vises and since i work with odd shape wood once in a while if you are interested in a different vise or want to sell it please PM me.
nice looking vise and did you find at a sale or is it one you got from one of your relatives? share any history you might know because the stories are almost as interesting as the vises.