The tables look small enough to be OEC and the pavilion faceting looks oldish. However, the culets are too small for a classic OEC. Possibly, a jeweler had a diamond cutter slightly modernize them some years ago to make the stone a bit brighter without losing any important amount of weight. This was a very common practice. The pavilions might have been slightly altered to close the culet and maybe a nick or two at the girdle was removed. Maybe even the girdles were rounded. Diamonds like you are showing were the result.