Vespa 125 motor VU1M, Verkaufswert?

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I happen to have a 1953 Vespa that was made from spareparts and used as display and for marketing purposed.

I have had it for 14 years but I have never started the Vespa.

 

Finally taking a closer look at it, I have come to realize that when it was build

they used a Vespa U Engine instead of the normal VM1 Engine.

 

I believe this Engine is quite rare..

 

What can it be worth ?