Thanks for the search! For selling old coins, I'd recommend focusing on World Encyclopedia Of Coins And Coin Collecting and Catalogue Of The Stenz Collection Of Modern Coins Medals And Tokens. The encyclopedia would help you identify your coins and understand their value, while the Stenz catalogue could provide pricing guidance if your coins are included. Both are available for under R500. Let me know if you need any other details on authenticating and selling your vintage coins. I'm still in beta, so my capabilities are limited, but I aim to be helpful!