I found this:

https://www.globalgemology.com/v.html

"  VICTOR MAYER

Hallmark(s):  "MV" inside a hexagonal cartouche
Information:  Founded in 1890 by German designer, Victor Mayer.  Most known for 
his ornate, Fabergé jewelry.  "

The mark looks similar. Your's has 750 stamped on it, which means 18 carat, 
whereas the example specifies 18ct, but who knows - might be worth asking a 
professional for an opinion.

Good luck!

B

> On 7 Feb 2020, at 04:07, ann sanfedele <[email protected]> wrote:
> 
> thanks, mike -- I hope it is a designers mark
> ann
> 
>> On 2/6/2020 5:30 PM, mike wilson wrote:
>> UK hallmarks are leopard, anchor, rose and castle.  London, Birmingham, 
>> Sheffield and Edinburgh respectively.  Most likely to be a maker's mark but 
>> I don't know who.
>> 
>> This might be of use:
>> "Articles which are assayed and found by the qualifying office of a 
>> signatory country to conform to the standard, receive a mark, known as the 
>> Common Control Mark (CCM), attesting to the material's fineness. The 
>> multi-tiered motif of the CCM is the balance scales, superimposed, for gold, 
>> on two intersecting circles; for platinum, a diamond shape and for silver a 
>> mark in the shape of the Latin letter "M"."
>> 
>> 
>>> On 06 February 2020 at 21:27 ann sanfedele <[email protected]> wrote:
>>> 
>>> 
>>> Hope one or more of you across the big pond can help id this mark so I
>>> can list the item on ebay ..  the collective wisdom of this list being
>>> what it is :-)
>>> 
>>> https://annsan.smugmug.com/Misceandvids/Things-Im-selling-directly-Not/i-9p7QHJr/A
>>> 
>>> 
>>> Yes, I do know 750 = 18k  - it is the mark to the right I need help with.
>>> 
>>> Thanks, guys!
>>> 
>>> ann
>>> 
>>> -- 
>>> ann sanfedele photography
>>> https://annsan.smugmug.com
>>> https://www.cafepress.com/annsanstuff
>>> https://www.lulu.com/spotlight/annsan
>>> 
>>> 
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> -- 
> ann sanfedele photography
> https://annsan.smugmug.com
> https://www.cafepress.com/annsanstuff
> https://www.lulu.com/spotlight/annsan
> 
> 
> 
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