Hobron Drug Company was based in Honolulu, and was owned by T.W. Hobron, the son of a famous retired sea captain, Thomas H. Hobron. T.H. Hobron made himself a wealthy Hawaiin businessman through a sugar plantation and a railroad and port used to haul and load the sugar for export.
The J/C list for these cancels is short:
My collection holds one cancel unlisted by Joyce, the 1/8 cent example below:
1/8 cent 1901
unlisted by Joyce
The updated list for this cancels is available at the following link:
Updated Hobron Drug Company Printed Cancels List
A recent auction contained this lot connected with Hobron Drug Company:
Hobron Drug postal cover from the June 2010 Regency Superior sale.
The online catalog included this note: "Pahala, Hawaii cover to Hobron Drug Company in Honolulu franked by 2¢ brown and with purple target cancel, plus matching Pahala date cancel, Meyer-Harris 281.01. Cover with backside advertisement in blue for Alhambra, 'beverage made from pure rich fruit juices'."