I bought this rifle at Holt's in July. ATF is asking for a model number. There's none marked on it. I've ran across a photo of an European model only but it has the model "NO" marked in the usual place. Any help is appreciated.

GES. STEYR 7.62x63mm MANNLICHER SCHOENAUER BOLT-MAGAZINE SPORTING RIFLE, serial no. 2739, 23 1/2in. nitro barrel, ramp-mounted bead fore-sight, rear-sight missing, manual flag safety, detachable floorplate, 14 5/8in. well-figured pistolgrip stock with cheekpiece, sling swivels