Unfortunately I don't recognize the maker's mark but the hallmark (the worker's head with a sledge hammer) tells us that it is made in Tallinn, Estonia between 1927-1954.
The worker's head in an oval frame was used 1927- 1954. At that time Tallinn's assay office used the Cyrillic letter Н (Latin N. On 14th July 1959 Tallinn's H was changed to Э) The oval frame was superseded with the shovel frame (клеима и Лопаки) 1954-58 on small objects and the oval frame abandoned. (Hellenic and Cyrillic letter should not be mixed in this context.).