Woodbridge Antiques has dated this piece to the Victorian era.
Maker's marks are also very clear for the silversmith John Harris IV.

Rare to find a pair of such a large spoons and in such great condition.
Condition: These spoons are in excellent antique condition.
Measurements: Each spoon:
Length: 30.3 cm approx.
Width of bowl: 5.8 cm approx.
Depth: 4.5 cm approx,
Combined Weight: 263 grams approx
Woodbridge Antiques has dated this piece to the Victorian era.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page