There's a good stencil list here:
But Top Tone isn't mentioned.
A good starting point would be to look though the pics at saxpics.com, paying special attention to the LF little finger keys, RH little finge keys, C# keyguard if it's a wire guard. Serial number may be another clue. Some stencils had serial numbers from the manufacturers range.
Some photos would help a lot. Especially detailed shots of the keywork.
The 'vintage' in the thread title made me think you were talking about an old sax (let's say over 30 yrs), in which titanium wouldn't have been used. Sorry I misunderstood you, I didn't realise they were using vintage in the name of a recent model. .
Did you buy that alto from Italy on eBay ? I wish I had seen it as it looks very interesting and the price was quite good.
Please tell us how it plays.
I have seen and played one of the Toptones. They were available with a full set of those funny pads, or with just the larger ones in the bottom half of the horn. They were Dutch designed if I remember but I think made in Taiwan. A bit like Stephanhouser, these were one of the earlier attempts to take a Taiwanese horn a bit more up market before the likes of Mauriat actually got it right. The Toptone was OK but nothing special, indeed it played like was what it was, a decent intermediate horn.
Are you thinking of the B&S Codera Reso-blade sax ? A bit of information here .
No longer made but very interesting. I don't know whether the Reso-blade keys were titanium, but I have got this description from an old WW&BW catalogue:
These keys aren't merely replacements for pads - they are reflectors in the truest sense, offering greater tonal resonance.
The Reso-Blades are found on the lower stack, the bell and the bow. The name "Reso-blade" comes from the fact that the whole key is no thicker than the material which makes the tone hole chimney. The "Reso-blade" is also polished on the inside face, which allows the key to act as a resonator. The Reso-blades are self-sealing, sitting perfectly on the tone hole.
This technical innovation was first introduced by Selmer Paris in 1951. Improving on Selmer's idea, the creators of the Reso-Blade redesigned the sealing ring, which reduced dampening of vibrations. As a result, the whole instrument resonates, not just the Reso-Blades - creating an exceptionally rich, expressive sound.
Wolf Codera was the man behind this design and there is more information from him here and about him here
I think that Milandro on this forum may know more about this ...