Unknown French Coin To ID

First photo 11:00-12:00 is GR, perhaps part of "... D G REX.." Looks like an S at 8:00. Double annulets as punctuation, visible at 1:00 and 8:30.
Reverse, starting from 12:00 looks like + T O N, and ends with X an 11:00. Though more normal would be M O N E T A (place).

Otherwise, I think we need to go by the cross with fleur-de-lis tips on the reverse to look for a match.

Tough

I rotated the first image 90 degrees counterclockwise.

I can sort of make out 2 lines of letters:
BRIT
()NV

A number of the coins of Charles de Blois had the obverse inscription in the Circle BRIT TONV.

The reverse (image 2) is right side up and it matches very well MONETA DUPLEX with a cross at 12 o'clock.

I cannot locate an obverse inscription that has GR_:

However, reading up on these coins, there are a number of types issued from a number of towns, and a number of inscriptions, not well-illustrated.

Does my interpretation, that this is indeed a coin of Charles de Blois, or at any rate one from the duchy of Bretagne (ca) 1350, make sense to everyone?

According to one source, coins of Charles de Blois are fairly common but most are not in great shape, being made during the war of the Breton succession.

The history of this war itself is a bit crazy. How many died to determine which ruler got to exploit the peasants?

Thanks. These horribly worn medieval coins are quite the headache to attribute...

I agree that the reading of the inscription in the circle as:

FRAN
CORV

is more plausible.

However, I cannot find any images with this inscription in a circle.

Has anyone seen any? If so, could you give me the link?

All of the ones of similar style show:

BRIT
TONV

or something similar.

@erafjel, thanks. The Jean II seems to match the design elements fairly well, except for the inscription on the obverse. The weight is wrong, but the illustrated specimen is badly clipped compared to mine.

I'm not seeing an O at all, unless the gothic O looks really unlike a regular O. Which I don't think is the case.
(Now that I think of it, there's an O in MON[ETA] on the reverse, which has approximately the shape I expected.)

Here's what I see (relative to the rotated image):

3:00 to 6:00 N? N E S annelet* (faint, but relatively clear, especially the second N at 4:00)
6:00 to 7:30 D? I? ? annelet? (can't make much sense of those letters)
7:30 to 10:30 G R ? annelet (this much is clear, assuming that's what a G looks like)
10:30 to 12:00 D? R? X? (only the upper left line of the third letter is visible, but it fits an X and not much else)

The section from 12:00 to 3:00 is flat and/or clipped, and would not yield any more letters.

This is consistent with a legend reading [IOHA]NNES:DEI:GRA: and either DVX or REX; the latter fits the letters I see slightly better.
Brittany did have several 14th century rulers named John/Jean, so in principle it could be one of their coins.
On a quick search I couldn't find any example (either French or Breton) that had the two-line legend in the circle placed so low, and/or that had a [name]:DEI:GRA:[title] legend.

Come to think of it, with some squinting we could probably read [IOHA]NNES:###:FRA:REX, which I think might fit the catalogued legends slightly better, but I can't figure out what the ### could be.
I'm reading BI[S?], which makes no sense, I think? The first letter could also be an E or, with some squinting, a D, and the third letter is just a blob at 7:15.
I think I can read DEI if I try, which would fit if the G actually is a G (which it probably is, now that I think of it), but we'd have to assume some damage at 7:00ish to make the E look like an I.

Maybe I just misinterpreted the letter spacing and the D starts half a letter earlier (immediately after the annulet, nearly touching it).
Then I can kind of see EI in the next two letters... on second thought, it would require a rounded E, while all the other E examples on this coin - in [IOHA]NNES, in [DV]PLEX, the visible left part in MON[ETA], and in REX if that's what it is - are plainly rectangular (plus serifs). So that doesn't work either.


*) I'm assuming that "annelet" refers to the two-ring colon thingy; I don't think "annelet" is the correct term for it, but I couldn't find the right word on Google, so I'll just keep using this one for now

[EDIT: apparently this forum's editor joins together my multiple question marks; I exchanged them for other symbols in the one place where the number was important, and I guess I'll just have to live with being less clear everywhere else.]

The most recent catalogue is Les Monnaies Françaises Royales de Hugues Capet à Louis XVI (987-1793) by Jean Duplessy, 2nd ed, Maison Platt, 1999. It comes in two volumes, Jean II is found in Volume 1. It can be found on Amazon for instance, but it is pretty costly if you are just going to look for a specific coin.

You can however find 19th century well known and still used catalogues in the public domain online. I would recommend Les Monnaies Royales de France depuis Hugues Capet jusqu'à Louis XVI by H Hoffman, published 1878 but still a good reference. There you will have all the inscriptions known. It can be found as a Google Books scan here:https://books.google.se/books?id=4p...ge&q&f=false

I have checked both books without finding a good match for your coin, however...

Yes, it would not be worth it to get the catalogues for a single coin, but if I ever got a hoard it might be good. I can handle written French in a passable way, so that would not be a big issue. But since @erafjel cannot find a good match, it may be that we either have an uncatalogued variety or that the coin's wear is giving misleading or insufficient details.

Like most people, I like closure on a coin ID, but this one is not giving up all its secrets yet.