Well the simple answer is in its present state, it is not worth very much.
Its worth about £5 to a hobbyist who wants to restore it for fun.
The wear on the spine shows that it has been well used in the past.
The blade needs to be hand sanded to remove the rust.
The edge needs to have the dings removed and a new bevel set and sharpened to razor sharp.
The handles will need to be cleaned and polished.
The pins need to be checked for tightness and the blade checked to ensure it closes centrally in the scales.
The whole thing then needs to be sanitised and oiled.
To then sell it, you will need to photograph and advertise it.
You will also need to wrap it and take for posting to a prospective buyer.
So there is a full days work if you have the tools and materials to do the job between you and the sale.
So, if you can do all of this and present the razor in a shiny shave ready state, I would think it worth $60 to $80 maximum in the USA if you pay the postage too get it there.
Now if you put it on E Bay and fake the photography and lie a bit, well who knows what some mug might give you for it.
That's the kind of razor I'd buy, but only because I like to buy my razors in that condition and restore them as a hobby.
I deliberately buy razors in poor condition because it's enormously satisfying to me to turn them into something good again, and I get to feel smug that I paid so little for them
So far I have six vintage straights, all in very nice condition, four of them over 150 years old, and none of which I have paid more than £8 for, including p+p.
Yeah theres a bit of hone wear and scum that needs cleaning off, and it will need a bit of work to clean up that edge, but old le grelots dont come up much, and since the TI ones theyve been in higher demand.
As is about $20usd, all clean and pretty $60ish maybe.
ps - whats the number on the rear side of the tang?