unidentified ancient coin [opgelost]

Hello!

I am currently struggeling to identify the following coin, which is about 14 mm in size.

I would be happy to get some hints, which help me identify the coin!

Best,

Peter

Could it be this coin:

Manghir - Anonymous attributed to the second reign of Mehmed II, Constantinople

Features

Issuer

Ottoman Empire

Sultan

Mehmed II (1444-1446, 1451-1481)
 

Type

Standard circulation coins

Years

1451-1481

Value

1 Mangir (1⁄40)

Currency

Akçe (1327-1687)

Composition

Copper

Weight

2.66 g

Diameter

14.8 mm

Shape

Round (irregular)

Technique

Hammered

Demonetized

Yes

Number

N#

127141

 Pictures brightened and cropped