This Dutch typecase configuration matches the No.1 Onderkas of the Nederduitsche Letterkassen of Zweijgardt: De Boekdrukkerij (1822) edited by Janssen & Bouman, Enschede/Grafisch Studie-Centrum (1986). It is the same as Onderkas No.2 apart from the extra division in the top lefthand box. The companion upper case is Bovenkas No.1.
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