The stripes are doing double duty on my Stella. They milked Louison Bobet's accomplishments for all they could get.
On my 1973 De Rosa they seem to be claiming the stripes early. Eddy had a couple of world championships by then and was riding a De Rosa, but I don't think he rode a De Rosa to a World Championship until 1974. Mine is a repaint, so it could be bad decaling, but I've seen a couple of others De Rosas claimed to be from 1973 that have the stripes and what looks like original paint.
LeMond seems to have demonstrated that the stripes follow the rider, not necessarily the builder.
And, Masi, well, they can probably do whatever they want, including claiming the same year twice.