Portrait of a Knight

Not signed on the back: on the canvas upper right old adhesive residue on the stretcher centered a rectangular, edged stamp "REICHSLEITUNG / HAUSINSP und 2 Hakenkreuze" crossover top with blue grease crayon, top right "31813" (Munich number) on the cross brace in the middle again stamped "REICHSLEITUNG / HAUSSINSP.", bottom left label BStGS "Inv. 11897", also in red "PR" (Photo Roth), on top of the frame to the left in blue "31813" (Munich number) next back stamp "REICHSLEITUNG / HAUSSINSP.", top right note with jagged edge on handwritten "Ölgemälde 57", illegible on the vertical center bar with pencil writing "Dem ... Guille.. Hulla .. Esq..Consitus" (?), below in blue "541"