The following record cards and documents on Werner Weissenberg were found in the ITS database; we consulted the version held at the Wiener Library, London
Search forms
There is the standard yellow document on my father in the ITS, shown here:


The second page of this suggests that there ought to be more documents to be found with reference to Dachau, but so far nothing has turned up in searches. Many documents were destroyed, so it is possible that this is all that remains.
The Red Cross
The next document is a Red Cross letter:


Frankfurt am Main
Finally here, there is a one-page document as follows:

International Tracing Service record cards
In this section, I have uploaded the ITS reference cards from which the above documents have been sourced.
The first card, below, refers to the registration document, shown above. It confirms Werner’s name, date and place of birth, last residence as Frankfurt am Main, nationality, and gives reference numbers from which to locate documents. The ordner is the file section number (2029), the fiche nr. is the microfiche number (20126) and the seites is the (page) number (77).

According to the ITS glossary, Formblattlisten are: form page lists (i.e., a type of postwar archival survey form recording the names and other personal data of individuals documented during the War in a variety of contexts such as employment, residence, marriage, death, etc., in local and regional archives; in an ITS archival reference context, the term Formblattlisten is used as part of a type/location designation; e.g., Formblattlisten SK Freising‖ [in full: ―Formblattlisten Stadtkreis Freising‖] refers to the Form Lists section of the ITS Archive for the area of the city of Freising‖. Note: The actual records described in Formblattlisten are not usually held by the ITS Archives, but are instead available directly from the local archives as indicated.
The second card confirms that we are looking at the right person, and again points to a document held on the database.

According to the ITS glossary, the code at the bottom can be interpreted as follows: when seen at lower right of a ―Suchst. 33‖ [i.e. ‖Suchstelle 33‖ or ―Frankfurt Search Station‖] style card in the Central Names Index, this indicates that a deportation list of Jews from Frankfurt exists in the Gestapo Transport Lists collection. Note: Please see ―Suchstelle Codes‖ appendix near the end of this Glossary for a fuller description of these materials. See also entries for: “Suchst.” and “VCC 155”. Suchstelle simply means search office/station.
The third card (below) again confirms the personal information as well as the fact that Werner was imprisoned at Dachau, and the date on which he entered the camp. It also gives further document references, as follows.

GCC 3: According to the ITS glossary, older ITS Archives designation for records of Dachau. Note: the Dachau records section contains individual records easily searchable by name. Please see below for the document this eventually produced.

The fourth picture (right) depicts the reverse side of a record card. This gives Werner’s häftling number – his prisoner number – along with his release date (entlassungsdatum) from Dachau.

The fifth record card (left) again shows these key pieces of information to confirm the person, and the source of the information described (‘Original Dachau entry register’). It gives further document file references and confirms his last address in Frankfurt.
The final image is a scan of the original Dachau entry register, referred to above. Werner’s name can be seen towards the bottom left corner – his entry is the fifth from the end; the rest of his details are listed across the page.

This document, which is a photocopy, has a Reference Code 8054600 Title: Arrivals book, from 10.07.1937-05.03.1940 Extent: originally, 847 pages have been taken on inventory Number of directly linked documents: 863 Number of names: 863 Context: Immediate source of acquisition or transfer Original handwritten alph. camp register Property of US Army on loan to ITS Received on 1956-01-03 Scope and content: Arrivals book from 10.7.1937-5.3.1940 12405-37575 Fotokopien