I finally own a Mark VI and a Vito (Yani S-6) Soprano at the SAME TIME. I've taken MANY photos with the 2 horns "back to back." If interested send me your e-mail and I'll get you the photos. If someone knows how to post the photos on SOTW, it may also me interesting.
This is a basic visual comparison. Both are wonderful playing horns. My general conclusion is that Yanagisawa took the best of the VI and made slight adjustments (corrections where needed) but also simplified construction (less expensive). The Vito also happens to be for sale in the HORNS FOR SALE forum.
Serial Number (I believe both were made in 1977)
Vito (Japan) 07775XXX
Length (This was very surprising)
Vito: 25 3/4 inches
Selmer: 25 1/4 inches
Vito: 2 Pounds 12.5 ounces (1.26 kg)
Selmer: 2 Pounds 10 ounces (1.19 kg)
Palm keys extend away from the body of the horn slightly more. Constructed with 3 posts and 1 long rod screw hold the three pakm keys. Tone holes are not in a direct line and has the additional high F# tone hole.
Palm keys sit very close to the body. My F key is built out just a bit. 5 posts and 2 rod screw construction. Tone holes are in a straight line.
Left Hand Table
Very similar in feel. Selmer has 2 rollers on Low B Key and Mother of Pearl on G# Key.
Low C# Mechanism
Vito: Has a reverse spring similar to Selmer Altos or Tenors
Selmer: C# Key has a spring - different configurations from Vito but both feel the same.
Forked F# (RH)
Vito: Plain Flat Brass touch - slightly lower than Selmer - A bit more comfortable.
Selmer: Mother of Pearl touch - slightly high - particularly in comparison to Selmer Tenor
Vito: Brass thumb hook similar to 5 Digit VI Tenors
Selmer: Plastic - (I prefer)
Right Hand Side Keys
Typical Yani Large Metal Contruction (Not Post) One flat piece of metal bent into key Bracket. One bracket holds both the Side C and Bb Key. All three RH side keys are lower with the E key molded with a flare on top. VERY COMFORTABLE.
4 Post construction. Keys are VERY high with High E almost 2 high. All keys are FLAT. Oleg makes an adapter but I found that with the adapter the side keys are too high.
Vito: Has a high C# adjustment screw for the Pad on Pad configuration.
Selmer: No High C# adjustment. Other adjustment screws are similar.
Very different configurations:
Neck Strap Ring
Vito: Standard Ring soldered to body
Selmer: No Ring - Oleg makes on that fits in Lyre Holder. (I prefer)