Found coin collection- Roman coins fake?

[adcjones]

Hello everyone.

I'm not a coin collector but do have many modern coins from various countries which I visit. I happened upon some coins my grandfather had hidden away and I'd like to find out if they are real or fake. I imagine they are reproductions as I would find it hard to believe they are real. There are two of them, appear to be roman. I'm fairly confident I've identified one of them, but the other I'm lost on.



I'm nearly certain the above coin is this (or a fake of it):

Caligula, AV Aureus, new style. 37-38 AD. Rome.

C CAESAR AVG GERM P M TR POT, laureate head right.
AGRIPPINA MAT C CAES AVG GERM, draped bust of Agrippina right.

RIC 13; Sear 1824; BMCRE 14.

With permission of Münzen & Medallien AG, Basel.

I found this info on this website: Caligula, Roman Imperial Coinage reference, Thumbnail Index - WildWinds.com

The second coin is thus:

 

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[Mackaydon]

Second coin appears to represent this coin:
Severus Alexander Denarius. 232 AD. IMP ALEXANDER PIVS AVG, laureate head right, slight drapery on far shoulder / PROVIDENTIA AVG, Providentia standing left, holding corn ears over modius & cornucopiae. RSC 501b.
..as shown here: http://www.wildwinds.com/coins/sear5/s7922.html
Don.....
PS: Welcome to Treasure Net

 

[Bigcypresshunter]

The guys from Europe can tell you.

 

[coinman123]

They look like cast fakes to me, with a fake patina. Not sure about roman coins though.