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Hi all!
I have old teaspoon. I guess it's Swedish, 1814 (three crowns and year mark "H3"). Perhaps "L" is city mark of
Linköping. But who is maker F.T. and what means "78" - I don't know. Help me, please!
Will be grateful for any information.

Sorry but your guess is all wrong.
The marks on your spoon are Finnish not Swedish. Take a closer look at the crown mark. You will notice that it has not three crowns but one crown in a hearth shaped shield. It is the control mark for The Grand Duchy of Finland. The maker F.T. is Fredrik Tiander. L stands for the town mark of Lovisa a small town on the southern coast of Finland. Tiander was active there in 1823-1869. H3 is the Finnish year mark for 1865. The 78 mark is the silver fineness expressed in Russian zolotniks (812,5/1000 or 13 lot). A common expression at that time in Finland. The fineness expressed in promille took place as from 1891 when zolotniks and lots were abandoned.

Here you will find more information regarding Finnish silver marks: http://www.leimat.fi/en/

Hi Qrt.S!

Many thanks for your help! Very-very useful information!

Best regards. Alex.