Attribution cross

[Мимопроходил]

Сообщение от K-Maler

Probably. It could be made of wood wreck ...

In the Battle of Sinop Russian did not lose a single ship, if only to let the Turkish case - but not logical ...

Сообщение от Allena

And can not this be a memorable sign of the cross, dedicated disabled Sinop battle ...

Participants of the Battle of Sinop received a medal "In memory of East War" (something not particularly rare, inexpensive, often found on internet-auctions). Information that was some other insignia of this battle, have not met in one source.

Сообщение от U-niks

Another possible "footprint" - in the history of the Russian Navy are several ships named "Sinop"

Also inclined to this version. All luck!