Derogy Brass Lenses (various)

three Derogy lenses: (1) no.11496, early Aplanat type lens, focal length c.30cm focal length, front and rear element diameter 55mm, total height 75mm, rotating aperture disc, (2) no.19125 later Aplanat type, c.40cm focal length, front element diameter c.40mm, rear element diameter c.30mm, both bayonet mount, five Waterhouse stops in case, brass front cap, (3) no.20924, late Aplanat type No.3, c.20cm focal length, front and rear element diameter 32mm, one Waterhouse stop - all three lenses in good original condition