Best I can tell this set is German. It's a great set, and makes nice sharp pictures. Lots of fun to play with. The cells are marked as follows: 15cm, 25cm, 35cm, 45cm. On the main body the aperture is marked: 0, 1, 2, 3, 4, 5, 6. There is two spacers, which will make this wide-angle if removed. Cells are in good shape, no fungus, scratches, spots or separation, blades work smooth too. Ole previously told me, "Except for the 25/15 combination, all cover 4x5", and with the distance rings removed this one does too. For a given value of "covers". Oh - and the 45cm cell alone is a neat little landscape lens for 24x30cm or possibly even 30x40cm. Basically, the cells can be used in four different configurations: - Single cell behind the aperture, focal length as marked on cell, one spacer in place: Fairly decent landscape lens, worth trying. But needs LONG extension for the longest cells. - Two "neighboring cells", with shortest behind the aperture, both spacers in place, one each side of the barrel: Just about a "normal Aplanat"; fast speed and decent coverage. May be disappointingly sharp if "funk" is what you're after. Focal length is usually approximated by 1/F = 1/F1 + 1/F2 ( + 1/d), where even the original manufacturers ignored the "1/d" part of the equation when setting up tables which were usually included with the set. - "Gapped pair" - e.g. 15cm behind, 35cm in front: Slightly better than a single cell, but not by much. - Neighbour cells (e.g. 25 and 35), spacers removed: A "wide angle configuration". Gives more coverage at the expense of sharpness. Gets really whacky outside the limits of the "spaced coverage", only really increases coverage at very small apertures." Asking $225 plus shipping.