New technology drove innovation in Victorian architecture but design harked back to a period of nostalgia. Past eras were raided from inspiration. Regency classicism, the Greek revival, mix in a bit of Gothic and you had a continuous raid of the past styling.
A architrave with a difference it offers a bold frame and uses a number of different patterns.
A narrow outer edge gives way to a flat section that frame the door. Thereafter it scoops down to a flat section that steps inwards after a flat section.