Holy mark of musk) is a 1970 Indian Tamil-language film written and directed by Malliyam Rajagopal.

He shoulders all of the financial burdens of his sister's family and also arranges for the marriages of Somu and Thangam.

Due to Pichhai's inability to lie or hold his tongue, the future in-law family learns the truth of Minor's as well as Somu's behavior and calls off the wedding.

An embarrassed Somu blames Pannaiyar for lying while arranging the marriages and setting him up for humiliation.

Pannaiyar decides to cut off all contact with Kasturi's family – including ending Balu and Thilagam's engagement.

Thilagam and Balu clearly still love each other but are also loyal to their respective families and allow misunderstandings to fester.

Kasturi Thilakam was written and directed by Malliyam Rajagopal, and produced by Raju M. Mathan under Kavitha Arts.