Kya hoga jab ek contract bina express mention ke aapke paas aaya?

Maine kuchh dino pehle ek case padha tha 'P. V. Rajamannar v. State of Madras' (1948) 1 SCR 918. Yeh dono parties ne ek contract par signed, lekin express mention nahi hai ki voh ek contract hai. Ab main soch raha hoon, kya yeh case isliye important hai kyunki iska court ke pehle se existing contract law ka use hua hai, ya fir ismein koi special baat hai jo is contract ko valid banana ki hai.

Kya hoga jab ek contract bina express mention ke aapke paas aaya? Yeh samajh mein nahin aa raha hai main. Koi bata sakta hai ki kya lagu hai?