Hey mate, holy balls you need to see this thing, the guy wouldn't even let me take a photo, I tried buying it off him and he wouldn't budge at 700 and I must have got too excited as he ended up asking me to leave (politely). I put my hand up against and it had at least 4-6cm more, I measured my handspan at 19.5 cm when I got home.
It's in a 4 ft tank and could almost touch each side on the width side of things, I did purchase another two 6 month old sub adults from him.
He says it was big when he got it and has had for around 12 years.
My estimate would be 23-25 cm legspan, it's like looking at my tarantulas but through a magnifying glass, the sheer mass of it just blew me away.