Not sure about the B ,the 'O' perhaps month of November, the 1st '2' could most likely be the year, so Nov, 1992, (but this method was the old way).
They were really weird when it came to serial numbers, G was for a Gazzelle built Raleigh etc, I've seen a J serial number which was a SBU build sold in the US but usually they were marked SB
edit: could the 'O' be a 'C'? if so I reckon I know what it is
Not sure about the B ,the 'O' perhaps month of November, the 1st '2' could most likely be the year, so Nov, 1992, (but this method was the old way).
They were really weird when it came to serial numbers, G was for a Gazzelle built Raleigh etc, I've seen a J serial number which was a SBU build sold in the US but usually they were marked SB
edit: could the 'O' be a 'C'? if so I reckon I know what it is