This caught my eye for the counterstamp. The coin itself, of Galba, is very worn, but as he is an Emperor that wasn´t in my collection and all in cost less than 50 Euros, I couldn´t resist. If anybody knows more about the counterstamp and the letters below the owl, your input will be gladly received. GALATIA. Koinon of Galatia. Galba (68-69). Ae. (25mm, 12.8 g) Ancyra. Obv: ΓΑΛBAC AYTOKPATωP KAICAP CЄBACTOC. Bare head right; c/m: owl within incuse circle. Rev: CЄPOYIOC ΓAΛBAC CЄBACTOC. Mên standing left, holding patera and pine cone. RPC Volume: I №: 3565 Reign: Galba Persons: Galba (Augustus) City: Koinon of Galatia Region: Galatia Province: Galatia Denomination: Æ (27 mm) Average weight: 12.95 g. Issue: Series 4: (b) Tavium? (AD 68/9) Obverse: ΓΑΛΒΑϹ ΑΥΤΟΚΡΑΤΩΡ ΚΑΙϹΑΡ ϹΕΒΑϹΤΟϹ; bare head of Galba, right Reverse: ϹΕΡΟΥΙΟϹ ΓΑΛΒΑϹ ϹΕΒΑϹΤΟϹ; Mên standing, left, holding patera and pine cone Post your Galbas, with or without counterstamps, or anything relevant.
The owl countermark is Howgego 348. He gives no additional information other than Galatia:Koinon and cites five examples.