Astra is a Spanish manufacturer, been around for a very long time. They used to be imported by Interarms, who is out of business. Don't know if they are still being imported. They are good firearms.
I used to have an A90.
The A75L ("L" for Light) appears to have an aluminum frame instead of steel.
If it is anything like my Astra A100 (Sig220 Clone, almost) it will be a good buy.
I have had both if my A100s for over 15 years and have never had any problems from them.
If it were me. I would buy it without hesitation.