Spanish 1777 1 Real coin KM 411.1 size and weight question

I recently acquired what looks like an authentic 1777 1 Real coin with a PJ mint.  It is only 15 mm wide and weighs 1.3 grams.  The catalog shows a 22 mm width and a 3.38 gram weight.  Is this a fake?

do you have pics?

Here are pictures of the 1777 coin:

This coin looks genuine, but it isn't a 1 Real.

It's a 1777. Carlos III. Madrid. PJ. 1/2 Real. KM#410.1
https://en.numista.com/catalogue/pieces39134.html

Please, may you change the images in Numista catalog for your photos? The current images are of a wrong mexican coin.