Help valuing this vintage Guild?

[NippleWrestler]

You don't need to remove the bridge to shave the top down, it stays on, it gets masked off, top gets planed/sanded. Anything else is just making extra work.

Is the saddle slot deep enough to allow for that? Or does it needs 'deepening' to maintain saddle support?

It's deep enough. When I measured it it was 5mm deep, or about half the bridge. There's room in there as is, and there's wiggle room to deepen it as there's a lot of wood below the slot as is.