Puckerings has dated this piece to the 1850s.
The original name tag is also intact, unused.

The adjustable clasp has the original working padlock and original tiny key, used both unlock and lock the padlock. The approximate usable length of the collar is between 11 1/2" to 12 1/2".
A true Victorian gem in excellent condition, dating to around 1850.
Item ID: 35710
FREE Worldwide Registered Airmail Directly from London, England
Puckerings has dated this piece to the 1850s.
A quality online collection of fine english antique smalls with free worldwide shipping from london, england
You can view the stock and full dealer information on the Puckerings Profile Page