If you post the first part of the body number here we can get close to the date produced. According to TME magazine issue 9, official release here was January, 1968. Trim level and instruments were Mini Deluxe but it had a fresh air heater to help keep it cool.
In September 1968 the so-called Mk2 MiniMatic came out, it had Mini-K instruments and trim. It sold until late 1970 I think. I have a 3/70 example. Its body prefix is YA2S5.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
