Hi
let me show you different Jezler marks.
First, a mark from the late 1800, about 1880:
This mark is about the same age, 1880 to 1900:
Then here a nice small mark from around 1900 to 1920 in Art Nouveau style:
And here an early example of the mark how it is still used. This one is from the 1920ies:
As you can see, in early marks the shield has straight sides, and usually the fineness is marked next to it. Later and current marks have a shield with curved sides. Also, in newer marks the fineness mark is separate from the shield.
The Jezler mark on your spoon has a shield with straight sides, indicating an older mark, say 1880 to 1900. This fits well with the historism period where replicas of such Apostle spoon were in high demand. I think next to your Jezler mark was the fineness mark, 750 or 800. The two identical stamps which are there now were probably added to cover the finess mark. I do not know if this was done already at the time of manufacturing or later. At least it appears the "modern" mark was not wanted.
Nice spoons from the late 1800.
Regards, Jörg