Harper Broom #25 Coronette.  This is the "Cadillac" broom for sweeping fine dust. 
Sweeps fine debris: dust, light to medium dirt, sand and wood shavings
Effectively cleans smooth and semi-smooth surfaces
For indoor use under dry conditions: body shops, fiberglass shops, tire shops, welding shops, offices and warehouses.
Fiber: fine, split-tip synthetic 
Trim Length: 4"
Head only.