Madras High Court (Commercial Division), N. Anand Venkatesh J., delivered 17.9.2025: Arb.O.P.(Com.Div.)No.339 of 2023 under S.34/S.34(2A) Arbitration and Conciliation Act 1996 allowed; award dated 25.2.2023 (No.Arb/OP21/2021) of sole Arbitrator Mr.P.V.Balasubramanian — which upheld the respondent's claim to Rs.13 lakhs advanced in cash under a loan agreement dated 12.4.2018 (Ex.C1, second petitioner as guarantor) secured by an unregistered 'letter of recording' (Ex.C2) — set aside in its entirety, with costs of Rs.1,00,000/- on the respondent payable within four weeks. Held: (i) the arbitrator's finding that the contents of Ex.C1/Ex.C2 stood proved because the petitioners pleaded forgery and denied signatures is perverse — he relied on Rao Saheb v. Rangnath Gopalrao Kawathekar but disregarded the latter portion of paragraph 5 thereof, under which, where it is pleaded that the signer did not know the contents, the party proving the document may have to place materials proving such knowledge; execution is not admitted by mere admission of signature (Veena Singh relied on); the petitioners having disputed both execution and signatures, the burden lay on the respondent, who adduced no proof and failed to prove financial wherewithal; (ii) Ex.C2, though compulsorily registerable and unregistered, could not be acted upon even for 'collateral purposes' under the Proviso to S.49 Registration Act 1908, because the loan transaction itself was the primary dispute — per Paul Rubber Industries v. Amit Chand Mitra (revisiting K.B. Saha), full reliance on an unregistered document for the main dispute renders it indivisible and unusable; (iii) treating CW1's 'shop cash' statement as a plausible explanation of financial capacity is perverse — annual income/turnover Rs.4–5 lakhs against Rs.13 lakhs lent (Rs.26.50 lakhs under two agreements), respondent not an income-tax assessee and producing no material; settled principles of appreciation of evidence bind arbitrators and their disregard attracts S.34(2)(b)(ii). The award therefore falls foul of S.34(2)(b)(ii) and S.34(2A); the respondent's Ssangyong 'eight pigeonholes' submission was not agreed to.