Good catch!
The 24mm series A is a beautiful little lens.
The only other 24mm that competes in size and ease of use is the Sigma Super-Wide II. It doesn't have the same build of the Pentax, though...
Did you acquire any amazing projection lens recently?
As a frenchman, you have the chance to score a french projection lens in some flea market.
I don't think they are common in France... but I guess they are extremely rare anywhere else
I found an Isco, resembling the Schneider Cinelux lenses in both colour and build.
Given the shape/size it could be adaptable. I'll see...
Isco Ultra Star HD 80mm (speed is missing, probably f/2)