Rodney

Welcome aboard! I have a couple with the last patent date of 1913 on the bobbin cover plate. Some manufacturers kept the patent dates on their machines long after the patents expired but you would know that they weren't made before that date anyway. The teens or into the 20s would be a good guess based on the style of the cabinet-assuming it's the same as the machine at the beginning of the post. I can never remember who to call to get a date for White machines. It might be Singerco.com. I'm told they have manuals available for the old White Rotaries as well. Hopefully someone will chime in with it.
Rodney

Edit: Looks like the post above yours has the number listed.