The following designs appear on continental European sets from 1963-1965 and in addition to the original sleeve & tray boxes, now also use a new Kliklok folding-lid style box.  These designs were not available to the UK.
Type EU-1	Type EU-2	Type EU-3	Type EU-4	Type EU-5
Type EU-6	Type EU-7		KLIKLOK® Folding Lid Box
The following designs appear only on supplementary sets 518, 519, 520 & 521 which were marketed to architects & designers from 1963-1965.  These sets can be found in both the Kliklok Folding Lid Box shown above and the 8x11 Plastic Box shown below.  The 8x11 Plastic Box features a thin card outer sleeve around a clear plastic container with a non-standard 8x11 stud plate as a base to the container which also had studs on the top.  None of these sets were available to the UK.
Type AR-1	Type AR-2	Type AR-3	8x11 Plastic Box (Front)
The architectural sets also feature different designs on the reverse side.  There is no correlation between the front and reverse side images, so Type AR-3 for instance, may feature any of the three reverse-side images below.
Type AR-A	Type AR-B	Type AR-C	8x11 Plastic Box (Reverse)