There is a copy of an Egenolff-Berner specimen in the Sabon Next brochure, from Linotype. If you e-mail me offline, I might be able to send you a copy of that. Don't know where the original is yet, though. Maybe in the Gutenberg Museum in Mainz? They have a good old Frankfurt specimen collection.

Something wrong somewhere.
Double Post?! Same as:
http://typophile.com/node/28972

1925
"Als Hausschnitt entsteht unter der Leitung von Dr. Rudolf Wolf (1895-1942) die Garamond-Schriftenfamilie der D.Stempel AG. Als Studienunterlagen sind die schönsten Pariser Drucke aus Garamonds reifster Zeit herangezogen worden, desgleichen die Klassiker des Andreas Wechel, der seit etwa 1575 in Frankfurt Schriftbestände aus dem Nachlaß Garamonds benutzt hat."

"Stempel-Garamond was designed 1925 by Dr. Rudolf Wolf (1895-1942). Based on documents of the most beautiful parisienne prints from Garamonds highest developped time. Although were used the classics of Andreas Wechel, who since 1575 used fonts from Garamond in Frankfurt."

Source:
http://www.schriftenservice-d-stempel.de/ChronikStempel.pdf

www.bleisetzer.de

For a facsimile see sheet no 2 in:
Dreyfus, John (ed.), Type specimen facsimiles. Reproduction of fifteen type specimen sheets. Bowes & Bowes: London 1963

The original specimen is in the Haeberlin / Mori collection of the Stadt- und Universitätsbibliothek, Frankfurt am Main. It was thought to be destroyed in the Second World War, but in fact it was only mislaid.
See also James Mosley's introduction on page [19] in
Harry Carter: A view of early typography, reprinted edition, Hyphen Press, London 2002

Thank you and sorry for the double post