Antique items?

I was wondering about starting to collect also antique items.
(Including for example Austria-Hungary, Finland, Russian empire and Belgium).
I was just wondering, before I start shopping ebay and buying a ton of items, is it profitable to buy for example a 1800's silver cup or a item that has belonged to a monarch from the countries above (A signed postcard, a document or even a fork) can I get it cheaper anywhere else than eBay?
https://www.ebay.com/itm/1913-DOCUMENT-SIGNED-BY-KING-CONSTANTINE-I-OF-GREECE-AND-PREMIER-E-VENIZELOS/332503979162?hash=item4d6ac8149a:g:rr0AAOSwZB9aSA~w
Are these sellers trustable?

my tip

stay away from ebay etc., save up and buy from reputable auction houses.

since you are from finnland you may try
https://www.bukowskis.com/fi?from_language=en

you may also try https://www.invaluable.com/ but there you really must know what you are doing. Still better than ebay though.

Thanks Hamster for sharing didn‘t know this website (invaluable), will look deeper into their offerings.

@apuking on invalueable there are a lot minor auction houses competiting. Minor means, less time for provence research ect. Its not always like that but very often.

Thatswhy i meant, you must be a senior collector, then you know the good houses anyway and then you can go on the hunt.

Citeer: "apuking"​Thanks Hamster for sharing didn‘t know this website (invaluable), will look deeper into their offerings.
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​https://www.drouotlive.com/?action=publicHome&controller=publicHome&lang=de

Here the french counterpart of invalueable