You have a Royal "Standard", made between 1914 and 1923. You can always tell a Standard due to the oval shaped bag connection, that has to be 'lifted up' to be removed from the cleaner. This is the second Royal upright model (the Model 1 was launched in 1910 - I have one of those too). On yours, the brush is still on the nozzle, this brush slid on and is removable. DO NOT operate the cleaner without putting oil into the sleeve bearings - you'll see the bearing oil filler caps that must be unscrewed to add a few drops of motor oil.
IF your machine was polished and in perfect working condition like mine, the value would be much higher than an unrestored example. Of course, any vac is worth only what someone is willing to pay. I've seen these models on eBay, unrestored, sell for between $30 to $40 dollars. I've seen restored models sell for a hundred or more.
