a vey ligth pentekontadrachmon (?) for Arsinoé ?

[labienus]

Hi,

I bought this coin a while ago and it took ages before I really started researching into it.
I'm quite perplexed : weight is 10,02 grs and diam. is 22 mm (i.e the coin is very thick).
This weight is very unusual - to say the least -.

I sent the description and pictures to the "Cabinet des Médailles" in order for one of the conservateurs to have a good look at it.
She came back to me with this view (that I translate) :
"this coin should be a pentekontadrachmon from the serie known as "Arsinoé au kappa" (205/4 - 180 BC). The weight should be around 14 g, so pretty abnormal ; reverse is also unusual (legend doesn't correspond to known examples, especially the lettering). Reference is Svoronos, 1904 n° 1242".
When I go to the 1242 of the Svoronos on line, it is a reference to a gold octodrachm (i.e the double of a pentekontadrachmon in gold) from Kleopatra I represented as Arsinoé I, the letter K behind and a dotted border which is consistent with my specimen.
So, is it standard from Svoronos to have the full spectrum of gold and silver coins "going down" from the mnaeion/octodrachm gold reference (but not mentioned/described by Svoronos apart from the mnaeion) or, for this precise issue, was the mnaeion the only known and described issue ?

My main guess is that this could an ancient fake although (accepting that I'm not a specialist at all) if so it looks well done. It has a lovely patina but if this was made even in the 19th century this should be highly possible.
This coin is a mistery to me. Any views would be very welcome.
Many thanks in advance.

[rover1.3]

A modern fake.

Here is a similar one from the Fake Reports,
https://www.forumancientcoins.com/fakes/displayimage.php?pos=-8458

best regards,

rover

[labienus]

Hi, Rover

yes, I had a look at this one before posting but the shape of Arsinoe's face or forefront was different vs mine so I wanted to be sure.
19th to early 20th century no (because it had time to build its patina) ?

[David M3]

A patina like that can come in a bottle, fakes can use glass window patina to give the coin instant patina. I have black in a bottle just like the color of yours.

[labienus]

Thanks to both of you for your inputs.
That was my 99.99 % scenario but wanted to be sure.

[Joe Sermarini]

Fake coin report please.