What is this cocktail? London dry gin, dry Curaçao liqueur, lime juice, and orange bitters.

Based on the provided ingredients – London dry gin, dry curaçao liqueur, lime juice, and orange bitters – it seems that while none of the listed cocktails exactly match these specifics, the closest would be "London Calling." Although "London Calling" incorporates dry gin and orange bitters, it features dry sherry instead of dry curaçao and lemon juice instead of lime juice, alongside sugar syrup. This cocktail offers a refined and sophisticated drinking experience with a harmonious blend of citrus and herbal notes. The addition of orange bitters contributes to its delightful complexity, making it an excellent choice for a cocktail with depth and character.

If you are specifically looking to utilize dry curaçao and lime juice, you may consider adjusting an existing recipe or creating a new variation, combining elements from cocktails like the London Calling and the Gin Fix, to achieve a tailored mix that suits your preferences.