Halstead Jewelry Supplies Gold-Filled Large Rectangle Tag Blank

Halstead

Rectangular shape with rounded corners matches exactly, Gold-colored finish ('Gold-Filled') matches, Presence of a top loop/bail for attachment matches, Blank surface matches the unengraved appearance in the frame, Material (gold-filled) is consistent with gold-colored, Overall form factor and dimensions appear consistent with a dog tag

Lacquered Brass Tag Large Rectangle - Blank

KeyRing

Rectangular shape with rounded corners matches closely, Gold/brass color matches, Blank tag matches, Single attachment hole matches, Material (brass) is consistent with appearance

Brass Dog Tags with Blank Rolled Edge

Ball Chain Manufacturing

Rectangular shape with rounded corners, Brass color, Single attachment hole, Overall form factor of a dog tag, Blank surface (consistent with source's lack of visible text)