I think this is ON 1119, the prototype Mersey. The number 12-000 is misleading since the boat did not have a name or operational number. It was built in 1986 and used for testing 87-88. Sold in 1989 and renamed Keelman then Spirit. The 00 indicates that it was built of aluminium. Fibre glass was used for 12-12 upwards. Source LBES Handbook 2008 edited by Tony Denton.