Large Turkish / Egyptian debased silver coin

[redwine]

38mm
12.85g

What exactly is it? Many thanks 

[Manzikert]

Turkey, 6 piastre, 10th standard (0.435 Ag), Mahmud II, Year 30 (1837)

Alan

[redwine]

Many thanks Alan 

[aws22]

Dear redwine,
Your coin is hopefully Ottoman Atilik, 6 Kurus, Sultan Mhamud II, Konstantiniya Mint.
KM#603
Wt. Varies from 11 to 13 gm.
Dia. 38 mm.
Metal Silver 0.435
Hope that helps.

Maythem