www.925-1000.com

Dear collegues, please look at the pendant in the form of a heart.

There is a hallmark with letter A.

Many thanks for any ideas.

Hi Olga,

Austro-Hungarian import mark.

See: http://www.925-1000.com/Faustria_02.html

Trev.

Dognose, brilliant! Thank you very much!

Hi,
Hungarian Assay Office offers historical import marks in PDF format.
https://www.aurumzaloghaz.hu/kepek/file/K18671937.pdf
EZÜST (silver) is on the right.
ARANY (gold) is on the left.
The import mark with assay office letter within the mark (seen in your pendant) was used throughout Austria-Hungary Empire from 1872 – 1902. It contradicts the information found elsewhere (1891-1902) but this is the most reliable document I have found so far.
Meaning, your locket can be dated 1872-1902.
Regards

AG2012, thank you very much! PDF is very helpful ))

It would appear the new marks came into force on the 1st January 1902:



Aus Oesterreich. Im Anschluss an unsere Mitteilung in Nummer 1 Uber die neuen österreichischen Auslandspunzen, bringen vir dieselben heute zur Abbildung und wiederholen nochmals, dass vom 1. Januar 1902 an Stelle der bisherigen folgende Punzen den ausländischen Ursprung einer Gold- oder Silberware kennzeichnen werden.

Source: Journal der Goldschmiedekunst - February 1902

Trev.