I had the same thought...

...I served the writs with a smile so bland
and I copied all the letters in a big round hand

I copied all the letters in a hand so free
that now I am the ruler of the Queen's Navee...
is from HMS Pinafore

but until I got to the author's name at the bottom I wondered whether there was another G&S play I wasn't familiar enough with - not Trial by Jury, maybe Utopia Limited or Cox and Box? Alas, no...

What are the dates of Mr Frank Waldheim? Was he perhaps a contemporary of Sullivan?