It seems like Prof Clive Graham, who was co-author of Kence The Trade Tokens of Strachan and Co in 1976, had second thoughts about many things written in his published work on the S & Co tokens, as in the next year (1977) he wrote to Natalia Issue 7 (Natal Society Foundation) saying
"" These are brass coins, in 3d., 6d., 1/- and 2/- denominations, bearing the inscription 'S & Co'. Details concerning the varieties and relative abundance of these coins have been acquired in an extensive examination of the coins provided, but historical details concerning the dates of issue, precise reasons of issue, etc., are conspicuously absent.""
"..The firm of Strachan and Company was established in the Drift (now Umzimkulu, East Griqualand), by Thomas and Donald Strachan, in 1858, but the first documentary evidence of the tokens is a reference to them in a letter dated 1907..."
Prof Graham then (three decades ago) asked readers of the Natalia newsletter to please provide info on the tokens they might have, but alas, it seems that nobody cared (or could not provide) any new info so we are still stuck now, 30 years later, with the date 1907
A million rand have been offered for many months as reward for evidence that they have been struck in the 1870s - as Wikipedia claims, and a R100 000 reward that they were struck in the 1880s, etc. but guess what
The unmasked Strachan and Co Token debacle has probably been the most prominent and exposed money-making scam in South Africas numismatic history.