Crikey, I can tell you the actual no problem, but its an 18.5" RM from the era, the changes over the years have not been major. They all measure c-t, which is (to me) most sensible, though effective tt is actually the critical dimension on any frame.
Actual and standovers have no effect on ride.
The 22.5" is measured to a point slightly above the ST top actual. I am just under 6' and take a 33" inside leg, ie longer legs than body.
No idea if that helps, but anyone is welcome for a ride on one of my RM in same size to get a feel.
If your looking for an Altitude, I have a 94/95 TO I may sell shortly in a ... 18.5"

I can't see me building it up as I have a 96 that rides so well, and an 89 Blizzard that really needs a good XT build.
Hey ho, still may keep this if it doesn't sell as it rides so well as a light SS. Not worth selling for less, worth more to me
The 2000/2001 decals are actually hard to replace, though personally think they are shite anyhow. I was going to replace with some different ere from Gil. The era looks cheap, would have been OK if original, but they have gone, so its replacement time. Sure Gil would create from pics if that was your desire.
There are a couple of paint marks on TT from bars, but not dented at all, there is some rub on HT, some rub on CS from tyre mud, CS by chainset is almost unmarked (amazing, but true!), otherwise fine frame. Couple of marks, but always looks worse as 1) frame with no decals, and 2) not built up.
When built, looks great
If you are not happy, will refund less postage - is that fair enough?