Hoping you're in a researching mood:
This Mancesa toilet may be over 50 years old, still works pretty
Well, uses 1.6g, on the inside of the tank it says Mancesa 2S or 25
And other imprints are illegible
But
I need to know the trap and flush valve specifications, most
Important is the dimension of the passage of matter from
The bowl to the pipe.

If you can help with this it would be so appreciated!
Thank you,
Forest Rosengren

Hey Forest,
Why are you asking these questions? The trap is built in to the bowl. Is there a problem with the tank parts that you're asking about the flush valve?

most important is the dimension of the passage of matter from the bowl to the pipe First Time I've ever been asked. Now I really want to know why you're asking. Can't wait for your reply, Tom

H Tom,
I need to see if it is the same
Diameter as modern toilets; we're remodeling
The bathroom and would like to keep it.
Its small, and this bathroom is a former
Closet - newer toilets would take up about
Half the width of the room and one already needs to crawl over the toilet to reach the tub controls. But it does not
Always flush waste with a single flush. If
The "exit" is smaller than current models,
Well, I'd replace it (reluctantly) but there
Is no other reason to replace it. If I
Replaced it without knowing the dimensions, I'd have
Less space and perhaps to my chagrin, may have another toilet with the same problem!
Help!
Thanks,
Forest

I don't think anybody's going to pull up specs on a 50 year old toilet. You have the toilet there why don't you take measures and we'll tell you how they compare. I'm looking at a American Standard regular bowl 1.6 flush and a 12 " rough. H= 28 3/6ths", W= 18" and H=27 3/4". They also make a junior sized toilet, H= 24 1/2" W+19 !/2" and H=26. However this is a 10 " rough. You might consider this for your "closet bath room" Good luck, Tom