Looks like you've spotted a rare bird.
I recently bought (and then sold) the Nikon RF version for $1200. An LTM, being much rarer, should be worth quite a bit more if it's in good shape.
It's a very nice BW lens, though not very useful for color (which is why I sold mine). It vignettes a lot and produces color shift and noise in the corners if you try to correct this.
If you like to collect things or buy/sell for $$, grab it. If you just want to shoot with that focal length for a modest price, get a CV – it vignettes quite a bit less.
If you acquire it and want a CLA, be sure to find someone who knows what he's doing. The aperture blades are tiny and fragile. Maybe DAG.
They don't really have to have a hood, because the lens is recessed so far into the mount.