Ferd. Ashelm was a Berlin business-book factory that no longer appears in supplier directories after 1945. The writing instruments offered under the name Cyclop were presumably not made in-house but bought in; whether stemming from Montblanc production cannot be established from a catalogue alone, since many manufacturers at that time made extremely similar products. A reliable assignment requires the piece in hand and the inspection of the mechanism. Montblanc did not make comprehensive office articles like glue or stamps; the additional articles in the Ashelm catalogue stem from in-house production. A complete reliable list of Montblanc sub-brands does not exist; the listings circulating on the internet are to be used with reservation.