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Can anyone help us identify the maker of this vase? It is marked MK 97 on the base. It measures 10.5 cm at the widest diameter and 7 cm high. It's heavy for its size. It has a strange combination of colours, but it works well. I've taken a couple of pictures in different lighting conditions.

Thanks in advance.

Anton

Just to add, Ivo's book (Miller's glass fact file a-z) has an entry for a Verreries de Costebelle, c.1926 who are said to specialise in lamps and lighting. This may be the same company as in the link above you can see a table lamp by Costebelle in a similar penguin design. It doesn't explain the identical boxes marked either Costebelle or Etling though.

Here's another Costebelle lidded box which matches an Etling pattern: https://musees-reims.fr/oeuvre/bonbonniere-123046718313325564 (same design as Etling 277, and also similar to a dressing table pot by S. Reich & co.: https://projetetling.wikidot.com/etling277)
I believe Etling's 274 flower patterned lidded box is also seen with Costebelle marks: https://projetetling.wikidot.com/etling274flower
and here is another Costebelle box which matches Etling's 274 'Boy and ball' pattern: https://www.antique-shimaisha.com/product/1229 https://projetetling.wikidot.com/etling274boyball

I do have another unusual small vase or lampbase in opalescent glass and depicting young children playing with a ball (may be related to the 'boy and ball box above) which is also unmarked, but I have seen the same pattern in colourless frosted glass mounted with lamp hardware and with a moulded 'Costebelle' mark in relief to the side. It's boxed up now, but I'll add a pic if I can dig it out.

I think the Guest Brothers mark on the vase might relate to the etched decoration on that vase. So Guest Brothers perhaps a red herring for our paperweights I think?

I honestly don't think they are lids - but I could be wrong of course.  And I think they'd just slide off the top of anything unless it had an upright lip to the rim indented for a lid to sit into.  I don't think they are lids really.

Here's another example of a green one - listed by Xupes as 'malachite enamelled pottery' but I don't know if that description is correct:
https://www.pinterest.co.uk/pin/402368547928618551/

Malachite is extremely difficult to research imho. I have a great love of antique malachite (too expensive for me to buy though).  I have a malachite box however, although I think it's at least vintage if not antique, I've found it really hard to research it.  I'm sure it's not recent but dating and researching it has been impossible.

I'll weigh mine if I can find my scales that vaguely work - to compare.  Although if yours also has 161 on they may have originated from the same place maybe?

I seem to remember finding a malachite version but the same shape that was a paperweight, so perhaps that's why I came down on thinking they were paperweights?

Also wondering ... if the one I found was malachite then maybe these were a fashionable shape made from some kind of granite/stone (obsidian??) - i.e. perhaps this was a carved and polished stone 'thing' of the time?

oh - There's a small part view of the malachite one here next to one like ours - unfortunately the listing is old and I can't bring up the complete photos of the listing:
https://picclick.co.uk/RARE-Antique-19th-Century-Malachite-Paperweight-%93-French-253559654507.html

Hence me assuming they must have been paperweights I think.