Is the Scotsman a sufficient source  Alan Massies article para  httpsportscotsmancomtopicscfmtidid   On the other hand a pdf on the SRU site says The firstever interschool match recorded in Scotland was The High School versus Merchiston played on  February   httpwwwscottishrugbyorgshadomxappsfmsfmsdownloadcfmfileuuidABBDEABDCACECBEDFsiteNamesru at the foot of page   So it would be necessary to stress the continuing nature of the fixture if I understand the claim correctly