Julie Cartwright Antiques has dated this piece to the Georgian era.
They have an unusual design.

Exquisite pierced arms.
Shell cups.
Not initialled
Hallmarks:
I.B for John Bourne.
Lion Passant.
Dimensions and weight:
Length: 13cm / 5.2 inches.
weight: 1.2oz / 36 g
Condition:
Good.
Old repair to extremity of one of the arms, very well executed and not easy to spot.

Postage:
PLEASE DO NOT FORGET TO ADD POSTAGE AT CHECKOUT.
Postage UK: £7 Special Delivery Next day.
Postage overseas: £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