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It would be helpful to see photos of the whole item to judge whether it's indeed medieval or not. To me the surface looks more like silver plated and there seem to be suspiciously many hallmarks for a medieval item.

I can't help with the hallmarks but the style of the set is very interesting. It echoes the style of neoclassical porcelain items from late 18th and early 19th century made for example by Meissen during the Marcolini period. Especially the handles are strikingly similar.

I would just have the broken piece soldered but only if the cost is reasonable. Removing the other bowl would damage the piece even more and make it look rather odd in my opinion. Despite their age Georgian sugar tongs aren't especially valuable so some might even just scrap damaged items although I...

Cast tongs are notorious to be quite fragile so most of them have had repairs at some point. Professional silversmith can probably fix the broken piece rather easily. Or were you thinking about replacing the missing part too? That might be quite expensive.

I found a drawing of Simon Jouet's mark on this book and it shows the rather distict shape of the mark: https://archive.org/details/oldlondonsilver00howagoog/page/n348 It's almost like a cloud (I don't know if there's a proper term for it) and the shape is very similar to the one on the tray. Additi...

Could it be Simon Jouet? His mark looks quite like the the mark here; especially the shape of the shield.

The hallmarks look fine to me. Although the maker's mark is unfortunately damaged it shouldn't be impossible to find a match. The last letter is probably script I (or J; might even be T) and the shield shape is also peculiar so if someone has time and patience to go through London makers' mark list ...

If hatching is applied properly [see: https://en.wikipedia.org/wiki/Hatching_(heraldry)] I would say that the field on the husband's coat of arms is azure (blue) as there seem to be horizontal lines. The fess and lions could be argent (silver) because there's no hatching. On the other hand the cross...

Based on the owners' initials it could be Scandinavian. The initials/names seem to include patronymics which were typical in Scandinavia. For example it could be something like Valdemar PettersSon Lund and Maria DanielsDotter in Swedish.

It's not Order of St. Vladimir but just a pendant shaped like an icon with a picture of St. Vladimir (or some other saint). But in any case it definitely doesn't look convincing.

I think the maker's mark is IB (or JB) but i couldn't find a match with any British silversmith's mark and it's also lacking the assay marks and the orientation of the maker's mark is also different than typically. I also tried to look around American coin silver hallmarks but couldn't find a match ...

Hello. It's Sheffield 1896. You need to use Sheffield date letter chart and not London: https://www.silvermakersmarks.co.uk/Dates/Sheffield/Date%20Letters%20D.html The maker's mark is correct. https://www.silvermakersmarks.co.uk/Makers/Sheffield-JA-JD.html#JD As a general tip you should always look ...

If the Bateman mark is upside down then the top letter on the left (in the picture as it is shown) could be partially visible B and the bottom right letter partially visible P so it would match with PB over AB.

Looks like Hanau pseudo hallmarks used by Wolf & Knell: https://www.925-1000.com/Fgerman_hanau_marks_01.html
Date is thus late 19th or early 20th century and the style is someting like neo-rococo.

To me the crowned leopard's head looks just like it should after years of polishing. The other hallmarks seem to be deeper so they are not that much affected by polishing. I have a salt where all hallmarks are worn by polishing so that only their outlines can be recognized.

The marker's mar SW is listed unidentified here: https://www.silvermakersmarks.co.uk/Makers/London-SS-SZ.html#SW The date letter could be "h" for 1743 which would be appropriate for the maker. Spoons were hallmarked on the stem at that time so the hallmarks are often "squeezed" a...

Crowned C was used in town mark for Karlstad in Sweden but then you would need to find three crown's mark, date mark (letter + number, like A4) and also a maker's mark (usually initials, like ALS). I can't really see what the small marks are and the one on the left is hidden by the photobucket banne...

I believe a professional locksmith can make a key for the lock, i.e. not just a copy of an existing key (which you don't have) but a new key made according to the lock. At least this kind of answer was found in some Finnish locksmith's FAQ.

My guess would be that it's Scandinavian. That kind of fiddle pattern was used also in Finland in the mid 18th century although I don't think it's Finnish or Swedish. It could be provincial Norwegian or Danish (or maybe from northern Germany) because it has just maker's mark and not any assay marks.

Regarding the names and the Grand Duke "connection" you should notice that in the name of the person mentioned in the letter - Aleksey Danilovich Kirillov - Aleksey is his first name, Danilovich is the patronym (i.e. his father's first name was Danil so it means "son of Danil") a...