Digby Antiques (Wiltshire) has dated this piece to the 19th Century.
The case is in good order, just one hook missing, see photograph.

Marked for London, 1837 William IV, hallmark was only used between 29th May and 20th June 1837. Makers mark for George Cowie.
Each catheter has the insert, one is a little stiff to remove.
Largest one 28 cm long
Smallest one 25.5 cm long
Digby Antiques (Wiltshire) has dated this piece to the 19th Century.
You can view the stock and full dealer information on the Digby Antiques (Wiltshire) Profile Page