I picked up a Winchester 435 with a scope on it, but no sights.
I've done some searching and I believe it is the same as the RWS 35? I that correct?

Thanks for your help!

Was really hoping that someone would lead me to a set of sights for this one! Please!

Yes, same as Diana 35.

Here's a link ta the part numbers: https://twchambers.co.uk/airgun-spares/diana-original/35/

Most stuff available is gonna be either on ebay by a miracle, or from europe.

Ugh! I’ll keep watching! Thanks!

Bought one of those about 1970. Shot the sh;t out of it. Killed a bunch of pests out of the garden. Dug it out a few years ago and it would barely put a pellet through two layers of cardboard. Original advert speed was something around 800 fps. Chronos now at under 400.
Estimates to rebuild were about $150. I bought it new for $40 something.