The door of durin.

[Galin]

Here's what we have (harping on this string for those not interested in Appendix F):

A) Moria -- Elvish
B) Hadhodrond -- Elvish

(either name is possible on the actual doors! and A might be in Frodo's original drawing, as suggested)

C) unknown Dwarf-name, inner -- Dwarvish language
D) unknown Dwarf-name, outer -- Mannish language

(D is the likely name for a 'public' door like the Doors of Moria)

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E) translated (outer) Dwarf-name -- Old Norse

(these appear in the drawing in the book published in the 1950s: Durin, Narvi hail from Old Norse and represent some unknown outer names of these bearded beings)

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If known, A through D can appear on something original to Frodo's day, like the doors, a tomb, a letter. All these languages are 'internal' and are imagined to be actually spoken way back when the story takes place.

Example E is wholly different, and cannot be found on anything supposed to be original (anything made in Frodo's time).