I don’t know that there is one particularly. There’s bits and pieces of all kinds of games but there’s no single game that I can point to. This is a bit like asking about influences again. Game design is also not purely mechanical, but can reflect aesthetics, goals, mood and so on.
Best answer I can give is my most played and openly influential games that I’ve done.
- Middle Earth Roleplaying
- Dragon Warriors
- Cyberpunk 2020
- Vampire: The Masquerade
- Mage: The Ascension
- Mind’s Eye Theatre
- FATE
- Iron Kingdoms
- Lamentations of the Flame Princess
- Traveller