Año de emisión de 1000 pesetas

En el foro inglés se busca el año de emisión del billete de 1000 pesetas Cortés

https://en.numista.com/forum/topic172528.html

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I found out that the two notes have different UV activity also. This is the dark frill:

And this is the light frill:

On the reverse the light frill also has this green UV ink on the sword, which is not present on the dark frill:

So it looks like they not only changed the design on the obverse, also the UV fibres and UV ink were changed.

Both of these notes have anti-Stokes fluorescence on the reverse. It is a small green square triggered by infrared at 980nm:

I filled in a contact form on the Banco De Espana website. We will see what they say. In the meantime I did more investigating with the notes that I have.

Did you know that they made changes to both the obverse and reverse of these notes?

I used the Oxford Image Comparison tool to make a composite GIF:

When they darkened the collar frill and jacket they also darkened the eyebrow and made the beard more dense on the side. They extended the shadow also towards the middle of the note.

Here's the reverse:

On the reverse also the eyebrow was darkened on the side and the beard was changed slightly. The right side of the moustache is lighter.

But the biggest difference is the registration device. On the note with the light collar, the colours are pink and green but on the dark frill they are blue and pink:

Now, I found a similar situation where a note was issued in 1992 and then changed, mainly by darkening and reissued in 1996. This is the 2000 Pesetas note, where I only have the 1996 issue.

But have a look at a toggle of images I found online:

The later note from 1996 has been darkened similar to the dark frill version of the 1000 Pesetas note. Especially around the face, the process is similar.

This makes me think that the light frill 1000 Pesetas note was issued in 1992 and the dark frill 1000 Pesetas note was issued in 1996.

Either way, it seems the 1000 Pesetas note will have to be split, just as the 2000 is. I am just waiting for confirmation that the light collar was issued in 1992 and the dark collar 1996.