Help Needed Identifying Danish Hallmarks Pre 1900

I am hoping that someone will be able to assist me. The pictured piece of silver is Danish in origin (confirmed by the Hallmarks?) and I think it is from around 1854. The makers mark is ATD. I have been told that this is the mark of Albert Telemach Dreboldt who is my great, great Grandfather. I am wondering if anyone knows how to verify this please? I have not been able to find any record of makers marks that early, however I have found several pieces with this mark that are attributed to him.

I would be most appreciative of any assistance that anyone can give me.

Nicky
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yes its him born 1811 in Copenhagen get citienship as a juveler 12/11-1836 he dies 1878.
The marks are to small to see. Under the 3 Towers you have year.

His Brother Peter Henrik Dreboit is also silversmith

Its for strawberry - a strawberry spoon.

Thank you so much Hose_dk. Do you know of any records that would officially list this as being his mark? I have not been able to find any records that go back far enough?

I can post larger pictures of the marks if you would like.

Regards,

Nicky

the mark is documented in Bøje - his book of silvermarks of Copenhagen.

You can read the year under the 3 towers. Rest is monthmark (tax mark) and guardein mark

Thank you so much. I truly appreciate your help.
I have managed to purchase a copy of the book so am very excited.

Nicky