It turned out to be Korean after all, the cardboard box it came in was made in the USA. "S85B60R"
The supermarket prices were from $110 for Chinese to $230 for European, I feel $150 to keep it Genuine is ok value.
The battery has a built in Hydrometer, it says "charge me".
Out of the box, 12.33volts, so I will top it up with a trickle charger before fitting.