The captioned text indicates a new fork, which it does appear to have, and probably some work to the rear triangle, it reads between the lines like it was reborn after a big wreck.
Happens all the time in the vintage race car world, but bike folk get all in a twist about it.
Worth the price? Not to me, but the $1300. asking I think is at the top of the market.
The earlier transfers work but are not period.
I think the chrome rear triangle is more questionable, I have seen chrome forks on a number of DeRosas but not chrome rear ends on track bikes.