'15th-century incunabula': An Apology

Several readers have written to me to point out that the phrase '15th-century incunabula' (posting, 15 January 2009) is a tautology, as all incunabula date from the 15th century.

I tried arguing that the latest incunabulum was in 1500, which might just be in the 16th century depending on your definition, but I was slapped down by the Curator of Old Kraut books.