Charger id double MM?

I have a charger pictured it has a double Joined m on it in also small letters which I think says Ncv and a small blue N in the centre circle with a blurred blue line below it, does anyone know the maker and age please?

I've seen that long blue mark before but can't remember the factory. Czech? Possibly a blank bought and decorated by whoever MM was.

The plate also has a post code on which has been put on by my relative who left it me, which makes me believe the plate is valuable as in antique, because of the effort to secure it.

It's possible they thought it might turn out to be a Meissen or a Servres

I can't zoom in on the image. But written initials on a plate like this are normally the artist. The way the plate is made point to a central European origin like Germany or Austria (as it was before WW1). It appears to be similar in a way to the KPM plaques made in Germany at the end of the 19th century. If you look closely at the design on the front you should be able to confirm if it is all hand painted, is an enhanced transfer (highlights added) or is matt and made up of tiny dots (completely a transfer).

Flowered chargers / plates like this used to be reasonably common and hang on walls from about 1870-1900. Value resides in the quality of the image, subject matter and size. Most individual painters are not recorded and don't add or subtract from the value. Factories like KPM are collected but it's unlikely yours is one of it's products. We don't give values around here but it's probably less than you think. They cost the same now as they did 40 years ago, so in real terms they have lost a lot. If you have fond memories of it then keep it. If not then an eBay search will give you what similar examples have sold for this year.