I don’t have a bottle at home right now, but look at the year of release. I’m forgetting exactly where on the bottle it is. Then go on to CellarTracker, enter Vega Unico in the search box, and un-check the “only show mine” box. The list that will come up is the various vintages, then the Reserva’s. CT has noted the vintage blends for each of the release years of the Reserva. Let me know if you have questions.
The only ones I’ve had showed the vintages on the bottom label, in those instances, there were 3 vintages which I believe is the norm with one release being an exception of having only 2 vintages; as you probably know, the vintages are not always consecutive.
I`d send the code to the winery and get their feedback.