Roman Republic - Brutus FAKE?

Brutus AR Denarius. 43-42 B.C. Obverse: LEG COSTA. Head of Apollo right. Reverse: IMP BRVTVS. Trophy of Arms. Crawford 506/2
Brutus. Denarius (Silver, 3.83 g 12), struck by Pedanius Costa in a mint moving with Brutus and Cassius in either western Asia Minor or Northern Greece, late summer-autumn 42 BC. LEG COSTA Laureate head of Apollo to right; border of ray-like dots. Rev. BRVTVS IMP Trophy including a helmet, shield, cuirass and two spears. Babelon (Iunia) 42 and (Pedania) 1. Crawford 506/2. CRI 209. Sydenham 1296.
Nothing is known about Pedanius Costa, who was the legate of Brutus who signed this coin. What is interesting iconographically about the head of Apollo on the obverse is the way the standard border of dots has been changed to tear-drop shaped rays, thus emphasizing his connection with the sun.
Please compare this to poster Michael Buras copy of the same coin, complete with corrosion. With the scarcity and desirability of this iconic coin, and the looks, I've always assumed it was a FAKE. It's interesting to compare it to another copy here in the Museum. But, NO, the copies are not exact copies of each other. Comments are welcome, register and submit.
Further info from Baldwins (UK):
M. Junius Brutus (c. 42 BC) AR Denarius, moving military mint, Pedanius Costa, legate.
COSTA - LEG, laureate head of Apollo facing right. Rev. IMP BRVTVS, military trophy holding pilae
and scutum. (Crawford 506/2).
This silver denarius of Brutus, struck at a moving mint during the civil war which erupted following the murder
of Caesar (in which Brutus wielded a knife), shows a distinct shift from the ideals of freedom and liberty promoted
by many of his earlier coins. Notably military in nature, the obverse depicts Apollo, with an inscription noting
the military Legate responsible for the coin’s production. The reverse focuses on a military trophy of mail armour,
shield, spears and graves, and proclaims Brutus as Imperator. Various other designs were issued by Brutus and
Cassius to pay their forces, but it would seem this issue was struck specifically to appeal to the soldiers.