greek soldier bust

I have searched everywhere and have found only one like this. There are no markings anywhere ad with the others m I found online. The one online was being sold with another soldier, was on a rectangular plaque with a gold gilt on spelter. They said it was Greek soldiers from the phygian-chalcidian period, 19th century and are listed on a few sites for between $5200-8000. My piece has a higher base than the other, but other than that they're identical. The helmet has winged horses on the crown area. Can you please help me determine value. Thank you!