Hello,
@Andrew Gorman is correct on the origin of this roadster in the above post.
Iberia was one of the brands owned by BH (Bestegui Hermanos) of the Basque country in northern Spain . The BH company has produced bicycles (and weapons) since 1909. There are some historical facts and wonderful photos on their website. I would suggest contacting them with details of your bike and they may be able to really help you.
Here's a link:
They are still producing bikes, mainly mountain and road bikes.
Try also searching for " BH Iberia bicicleta historia" online and you'll find lots of images of bikes similar to yours featuring that distinctive chain guard.
Here's another one from the 1950's, with a singlespeed, coaster brake hub.....
View attachment 1391547
Some of the Mexico based Cabe members may have knowledge of these bicycles; BH still distributes bikes there.
Good luck.
Darren.