At SB 3.8.28 the Lord is described 'hAreNa cha ananta-dhanena vatsa shrI-vatsa-vakShaH-sthala-vallabhena' — with the necklace of boundless wealth, which is dear to the Shrivatsa on the chest. The verse places Shrivatsa as a mark upon the chest.
Object
Shrivatsa
श्रीवत्स
Shrivatsa is the mark upon the Lord's chest. At SB 3.8.28 He is described 'hAreNa cha ananta-dhanena vatsa shrI-vatsa-vakShaH-sthala-vallabhena' — with the necklace of boundless wealth, which is dear to the Shrivatsa on the chest. Note that 'ananta-dhana' here means boundless wealth and not the naga Ananta, so no epithet row was added to Sesa.
Śrīmad Bhāgavata Mahāpurāṇa 3.8.28 — Sanskrit Wikisource (pinned chapter page; Devanagari from the cross-validated transcription in validation/sanskrit_skandha3.json)
The mark on the chest, to which the necklace is dear