Around the imperial eagle there is :
Ferd .. Romano Imperat
So Ferdinand I, II or III ?
It's not so easy to browse the SCWC

- 1/4 Thaler , Rietberg, 1619 : Crowned imperial eagle, titles of Ferdinand II, rev: Arms (Legend varieties exist)
- 2/3 Thaler, Rietberg, 1654 : Crowned imperial eagle, titles of Ferdinand III, denomination divides date, Rev; Helmeted arms
and for munzen under the rule of Ferdinand I (1556-1564) ...
and with "Quartered arms over long cross fourch" you directly cross the chanel