Howdy & welcome to the Quilting Board from Texas.
Not sure if this is the right manual for your machine but it is a Davis Vertical Feed Sewing Machine Manual. Hope this helps you somewhat.
http://ismacs.net/davis/manuals/davis-vf-manual.pdf
Here's some info on the Davis Company:
http://ismacs.net/davis/history_repe...e_company.html
Here's a link to a 2015 post where questions about the Davis model H was being asked. Lots of info in the replies:
Need help finding a shuttle, bobbin & needle