Julie Cartwright Antiques has dated this piece to the Georgian era.

The lower blade corrugated. Crested and initials to the inner handle.
They have a good gauge of silver, a testimony of their quality.
Hallmarks:
TN over GB for Thomas Northcote and George Bourne
Lion Passant.

Duty Mark.
Date letter "u" for 1795.
Condition:
Excellent.
Dimensions and Weight:
Length: 24.5cm / 10 inches
Height: 5cm / 2 inches
Width of blades: 1.5cm / 0.4 inches.
Weight: 124 g / 4.1 oz.
Postage:
PLEASE DO NOT FORGET TO ADD POSTAGE AT CHECKOUT.

Postage UK: £8 Special Delivery Next day.
Postage overseas: from £12 International Signed For.
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Julie Cartwright Antiques has dated this piece to the Georgian era.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page