What a co-in-side-ence !
One of these kits was sold in Berlin just a few weeks ago.
Surprisingly for only €92 + P. But it had been started and some parts were missing; rudders, motors, props and shafts etc.
Since it is an extremely rare kit from the eighties I would have expected it to go for around twice that. So if your kit is complete and not started it should be worth at least €150 - 200.
About 130 to 170 GBP.
Cheers, Doug 😎