As collectors will know, there are several authoritative books about the Dutch factories and their designers, most notably the two 'standard works' by Annette van der Kley-Blekxtoon and the exhibition catalogue 'Perglas uit Leerdam' by Thimo te Duits.
But none of these books is particularly comprehensive. Doubtless through lack of space, as well as lack of full documentation, several of the later pressed glass designs are completed undocumented in them. It's also been suggested that some writers consider pressed glass insignificant in comparison to Unica, completely failing to appreciate the design quality or widespread popularity of the factory products.
This page is intended to reveal the missing patterns using non-documentary methods, and encourage a discussion which will help to establish the full and correct details for them.
(A similar page on this site is being developed for the Kristalunie's output)

First we should take as reference two very similar designs whose manufacturer is not in any doubt. The green jug is one of the most-popular Leerdam products and was made in an identical colour to Neerlandia (1939). Notably the Neerlandia milkjug which has a 'ring-handle', rather than a 'tab-handle' was not as popular, The opaque yellow creamer (this yellow glass is named 'arcopal') ssems similar to the Colopal breakfast service by Copier of 1932 in colour and body-pattern, but was listed in the 1938 catalogue as Zonnebloem. The typifying points worth noting here are the shape of the handle (with a thicker section on the upper edges to make it safer in the hand, and a straight line from the bottom of the handle to the main vessel).
This is an under-documented but easily recognised pattern called Pijnappel ('pine cone') designed by Copier 1939 for production in the post-war period. Although the original fruit-bowl design was produced in groen-violet, the flatware was very popular at the time and was extended with light green, dark green, (brown)fumi and clear (helder) glass versions of the bowls in a range of profiles and heights. It is still easy to find examples of this pattern for a few euros, partly because the 'smoke' colours are now so unpopular in the market.	This is an under-documented pattern sometimes called 'Tudor' or 'Ribbon' and the milk jug clearly shows the same handle design as Neerlandia and Zonnenbloem (above). Only the creamer and sugarbowl have been found so far, so it may be that a planned nest of bowls was never produced. It's worth noting that the texturing of pressed glass was not general practice at Leerdam, where they had hitherto focussed on 'form and line', and this 'experiment' might have been inspired by the popularity of 'sugar glass' in the late fifties, and/or by the success of the textured Bambusa range from the Kristalunie.
This milk jug is in a pattern which we refer to as 'Diamond' ('Diamant') because its real name is yet to be revealed to us. We have also found examples from a bowl-set in this pattern, made both in emerald (smaragd) green and a matt brown. We have been unable to find any supporting documentation so far, but we think that the derivative form of the milk jug makes it quite clear that it's a Leerdam product. It would seem to date from the (late) fifties. Once again it shows Leerdam's development in press-texturing the surfaces, and the manufacturing quality of the product is particularly good, however it was never very popular in the market, possibly because the design seemed rather old-fashioned as the 'sattelite age' gave way to the 'swinging sixties'. It is reported by collectors that this pattern was made for promotional use by Spar stores.	The large fruitbowl in the Diamant pattern also features a impressed (repeat) design within the foot-rim.It may be one of the last pressed glass products to be made at the Leerdam factory.