Hi!
As pointed out it would be beneficial to see more detailed pictures. In addition the later Hebrew carving somewhat makes thinking go towards the later fake judica pieces but it is away from the origin of the piece and if that is ignored I would conclude the following.
From these pictures what can be said is that the tray would be handmade (as AG2012 mentioned needs to handmade be piercing). For example it can be clearly seen the uneven sizes of the piercings. For the markings they are to my opinion correct (with makers mark and assayer already mentioned by Qrt.S).
The neoclassical style of the tray is also correct for the time period. Also the style and usage of the piercing as a decorative element was typical in this time period on Russian silver for example on trays and baskets (bread, fruit, sweet etc.). The same piercing style was as well used in other countries in the same time period. The tray also has similar features as the one from the same time period shown by Mart.
Here is another example of a tray with similar piercings from the same period. Thereby in my opinion it is an authentic piece so congrats for the nice piece.
Silver tray, Saint Petersburg 1796.
Regards,
Juke