\documentclass[a4paper]{slides}
%\usepackage{a4wide}
\usepackage{german}

\begin{document}

%
% \Schild{Hoehe}{Zimmernummer}{Namen//Namen}
%
\newcommand{\Schild}[3]{%
  \begin{center}
    \makebox[15cm][t]{%
      \vbox to 7cm{%
        \vspace{0pt plus 1fill}%
    \arrayrulewidth=2pt
%    \renewcommand{\arraystretch}{2}
    \hbox to 14.5cm{\hspace{0pt plus 1fill minus 1fill}%
    \begin{tabular*}{13cm}[t]{r|l}
      \vbox to #1{%
        \vspace{0pt plus 1fill}%
        \hbox{\bf\Huge #2}%
        \vspace{0pt plus 1fill}} &
      \vbox to #1{%
        \vspace{0pt plus 1fill}%
        \hbox{\parbox[t]{10cm}{#3}}%
        \vspace{0pt plus 1fill}}\\
%      \cline{2-2}
       \hline
       \vphantom{\Huge 1} &
       \hbox{\parbox[t]{10cm}{
           Physikalisches Institut\\
           Abteilung Theorie
       }}%
    \end{tabular*}%
    \hspace{0pt plus 1fill minus 1fill}}%
    \vspace{0pt plus 1fill}%
    }}
  \end{center}
  \vspace{2cm}
}

\begin{slide}{}

%If you need to print your Office number,
%replace ``999'' by your number, 
%comment the line having \phantom
%and uncomment the next line

%\Schild{2.5cm}{{999}}
\Schild{2.5cm}{{\phantom{000}}} % <- if necessary, comment this line
{{\bf\large
-- Your name --
}}

\end{slide}


\end{document}
