Beautiful bike and lovely build. It’s difficult to say how much it’s ‘worth’ and of course if you have to sell it it’s only worth what someone is gonna pay for it.
I sold a near mint Master Pista build for 1250 (or maybe 1300 can’t remember) on eBay last year. It took a very long time to sell and I thought was reasonably priced.
I also have a Super Pista which I’m about to advertise for 1000... but it’s very different to yours... not restored, middle of the road crankset etc...
eBay has a few SPs up at the moment... some of them crazily priced - 1400 for a frame-set I think I saw... but hey... if you don’t ask you don’t get right : )
Anyway... useless ramblings perhaps... but a free bump and GLWS... it’s a pretty thing