Did you know that ETERNA, KAISER, and MIKI pianos were actually made by YAMAHA?
These brands were produced under consignment by specific YAMAHA dealers between the 1970s and 1990s. In short, although the names are different, ETERNA, KAISER, and MIKI pianos were genuinely manufactured by YAMAHA.

To give you a comparison: take the piano brands BOSTON and ESSEX. Both are originally designed by STEINWAY & SONS, the world-renowned piano manufacturer. However, BOSTON pianos are manufactured at the KAWAI factory in Japan, and ESSEX pianos are made at the PEARL RIVER factory in China—under STEINWAY’s design and guidance. Even though these pianos are not built in STEINWAY's own factory, they are produced according to its design concepts and offer more affordable alternatives, earning them a strong reputation in the international market.

In the same way, since ETERNA, KAISER, and MIKI pianos were manufactured by YAMAHA, they are excellent choices for those looking for "reasonably priced pianos made by YAMAHA."
You can often find the YAMAHA logo on the hammer rail inside these pianos, serving as visible proof of their origin.

Similarly, DIAPASON, MÄRCHEN, and EMPEROR pianos were manufactured by KAWAI. These second-brand pianos are usually based on original models by either YAMAHA or KAWAI, with some custom modifications. For example, the ETERNA E1A shares the same design and specifications as the YAMAHA U1A, but with upgraded tuning pins—from chromium-plated to nickel-plated.