Vintage Holkham Studio Pottery Mallard Spongeware Desk Tidy

Vintage Holkham studio pottery desk tidy or soap dish with mallards

• Vintage pottery decorated with outer wall green sponge print and central flying mallards
  
• Nice transfer printed Holkham pottery china marks as shown
• 10-1/8th-inch long by 4-inches deep and and 3.5-inch tall
• Is either a desk pen tidy or a soap dish?
• Printed Holkham marks as shown post 1970
  
• Extensive fine glaze crazing but otherwise in very good condition.
  
• I have not seen this pieces of Holkham before and any information on what it was originally sold as would be appreciated.