I've posted that my personal experiences in testing Towa objectives have shown a consistent lack of high-quality. Others have agreed, based on their own experiences with the brand.
While it has been disappointing most of the time, I want newcomers to Classic scopes to know that all is not lost simply because of a Towa maker's mark. There are several reasons why.
Early Towa seems to have a better track record at higher quality. Pre-1960 manufacture dates seem to correlate with better objectives. This has yet to be definitively demonstrated but it is a current idea based on member's experiences.
Refractor objectives aren't as viciously affected by small figure deviations as reflective systems. A 1/4 wave surface error stays 1/4 wave after passing through the glass, for the most part, wheras a 1/4 wave deviation on a mirror surface can mean a 1/2 wave error on the reflected wavefront.
Resolution limits by aperture are pretty easy to hit with small objectives. This is one reason many of us have had nice "sharp" views with small refractors, even though the glass may not be figured to aerospace tolerances. You won't be cranking up the magnification to 400X with a 60mm objective. 150X is pushing it, and that's just barely enough to see the bigger details on Mars at opposition, for instance.
Some Towa scopes have fairly nice mechanical features. The scopes can be enjoyed for those attributes even if the objective is only in the 80th percentile as far as quality goes.
And every once in a while, a nice Towa objective surfaces! I have one in a humble 50mm Milben, another in a Tasco 6TE. A couple of 60mm are pretty good.
Now, single-digit "good" objectives out of dozens tested doesn't sound like good odds, and for random purchases probably isn't. But if the price is right, it may be worth taking the chance. The objective might not be excellent, but it may be good enough for a grab-n-go, "quick look" scope. Or a modern replacement objective might be found, of better quality, and then you can enjoy the nicer features of the scope without being handicapped by poor optics.
There may be instances where a ten-dollar find at the thrift store turns out to be a fairly nice telescope- and it's good fodder for practicing one's restoration skills before making a more high-dollar purchase. These can be terrific scopes for learning the ropes of restoration.
The entire point of this post is that sometimes, it might be worth taking a chance on buying an untested Towa. Just don't have high expectations going-in, and don't pay a lot of money for it. If the stars align, you might get a nice objective. Don't place any bets on it, but there is a chance. And if you don't spend a lot of money on it, you should still be able to make it all back, and then some, if you part it out. There is no sin in parting-out a common Towa with a poor objective. Just be honest when you sell the objective, if it never gave you top-notch views. Some folks will buy bum lenses just to repair a display-only model.
Comments on your experiences with Towa are welcome.