Vespa ET3 Chassis number help

Can anyone help, I bought a vespa ET3 but its got a weird chassis number which I can’t find out how to date it.  I tried all the usual scooterhelp, technica manuals, vespa clubs but still no-one can help.  Some have said its one of the last of the ET3’s to be made ?

Here it is :  VMB1T * A1 88245 A

If anyone know more about this chassis or model or offer any website links that would be of great help.

If its an import and has or had indicators attached to hanlebar ends it could be one of very few made for i think the japanese market years after production of the et3 had stopped.