Thank you Oel and yes, the choice is mine and I pick Butter Cooler for the following reasons:
The links you show are all "modern links" so to say. The page I show and the page later shown in this input are genuine pages from catalogs from the past. My point is that a modern link to e.g. some auction company's site or similar is not necessary fully reliable due to the fact that it contains often a current opinion only and is not necessary based on real facts. This "opinion" or "explaining" text has been created of something that has been read from another current/modern link. It could be copied from a copy to a copy's copy etc. that had wrong information already in the first place. Unfortunately this is many times the sad reality and far from the truth.
Why do auction houses etc. so often call this article for Caviar Server? Here is the answer, calling it Caviar Server sounds much more fancy than call it a simple Butter Cooler/dish.
A fancy article will bring in more money. This is the correct answer!
However, if you bother to make some research and investigate old genuine catalogs, lists whatever, from them you will find sufficient and correct information. That is why I wanted to show WMF's page from 1906. That information cannot be denied. Below you will find a page from 1910 from Alexander Katch catalog from his factory in St Petersburg in Russia. In the related text it says that all items on the page are butter dishes (маÑлÑнка). This text cannot either be denied.
Kindly pay attention to article 535½ and on the cow on the lid on 532½ up left :-))).
By the way, cannot recall seeing the discussed object being called Caviar Server
in old documentation, have you?
After this I think we can make some conclusions and agree on them.
1. The article shown is a Butter Cooler
2. Do not unconditionally believe in what is written in Internet both in general and as well on certain sites, find out by yourself and expand your own knowledge.
Have a nice weekend
Qrt.S