Sorry for the novel hope this brings more clarity than confusion. The keywork differences and the clear difference in the type of plastic used in the first run of Normandy models confirm it in my mind, along with the fact that the first Vitos appear with serial numbers in the middle of the second Normandy series. Not to muddy the waters by getting the Normandy involved, but I'm 100% certain that there was a great deal of Normandy production before the Vito clarinets were introduced. The early ones had only the outline of the lyre engraved, as opposed to the thick stamping that most had. The earliest Lyre logo I've seen is at A25474.

I've recorded examples of the original Reso-Tone from 3054E to 9745J, the Reso II from 1427 to 3069, the Reso-Tone 2 from 01443 to 15686, and the Reso-Tone 3 from 05727 up. I've noted Clari-Tone serial numbers from 0968 through 8867, all with the oval stamping, and then one at 91358 which might have had a very faint lyre logo above the Claritone name, and the 'swoopy' C trill key. I can't find any evidence of the Clari-Tone in the 1974 price list, but the VSP is there. The Clari-Tone name was first used July 21, 1964. Two positively-confirmed dates: The 'Reso II' was trademarked as having been first used in commerce (meaning either when the name was first applied to a product, or when the so-named product was first shipped from the factory) December 27, 1962. The latter ones have the model number stamped next to the serial number, the former do not. They were changed to 72 when the serial numbers were reset in 1984. The model numbers in the '70s and early '80s were actually 71 according to price lists.

I can partly clear up the model number confusion earlier in the thread. I can answer any questions on that, but I'll start with some Vitos I've kept notes of that have crossed my bench in one form or another. I wrote the blog page referenced earlier which has apparently caused confusion.

Vito clarinet serial number lookup