I sold a 63A 2.5:1 for £875 with a 3 month warranty, took 2 years to sell then 3 desperate buyers came along all at once.
But to be honest wish I'd kept it in the garage as a spare, takes up next to no room .
Mine had a 1/2 inch hairline casting crack in the casing which had a plate professionally welded on the inside, invisible from the outside.
I had two 63A s offered to me for £150-£250 no warranty , there was a bad batch made 2004 ish which seeped oil when at high revs, they were changed under warranty but the dealers held onto the duff ones waiting for 'quarantine' before selling them off.
If selling offer a warranty.
If buying , buy new unless you know full history.