Prima Mushroom Concealed Fix Un-Sprung Mortice Door Knob (60mm Diameter), Satin Brass - SB2029 (sold in pairs) from Door Handle Company

Schlage Latitude Satin Brass Privacy Bed/Bath Door Handle with Collins Trim F40 V LAT 608 COL - The Home Depot

Concealed Fix Mushroom Mortice Knob

Prima Mushroom Half-Sprung Mortice Door Knobs (64mm OR 70mm), Polished Brass OR Unlacquered Brass - PB92B from Door Handle Company

Schlage Accent Satin Brass Interior Bed/Bath Privacy Door Handle in the Door Handles department at

Prima Mushroom Concealed Fix Un-Sprung Mortice Door Knob (60mm

Schlage F170 GEO 619 Georgian Door Knob, One Sided Non-Turning Dummy Door Handle, Satin Nickel

Mortise Door Knobs

SCHLAGE F40 GEO 608 Georgian Knob Bed and Bath, Satin Brass

Prima Mushroom Half Sprung Mortice Door Knob (54mm Diameter), Satin Nickel - SN92A (sold in pairs) from Door Handle Company

Schlage Orbit Satin Nickel Privacy Bed/Bath Door Knob F40 ORB 619 - The Home Depot