Identify hallmark - help?

[Sammyjane74]

Greek key bracelet

Hallmarked 925 silver

need to know what the rest of the hallmark means please?

Looks like a Greek omega symbol

Then an upside down 2 (or is it a zeta ?) then 30

TIA

[Bartholomew]

Omega mark look familiar to anyone? - Silver Collector Forums
Help Identifying Greek Silversmith Mark - www.925-1000.com
Omega sign - Athens, Greece.
Zeta sign 30 - manufacturer (year, region, or maker indicator).

[Jools]