Roman gold coin send for ID

19mm,7.70g

Well, even though Roman gold is way out of the orbit in which I normally travel, I see absolutely no reason to question its authenticity. I presume you know this is an aureus of Claudius. It’s obviously clear enough overall that there should be no doubt about the legends, but for the sake of form:
Obv: TI CLAVD CAESAR AVG GERM P M TR P laureate head of Claudius right
Rx: CONSTANTIAE AVGVSTI Constantia seated left on curule chair
Mint of Lugdunum, 41/2 AD.
RIC I 2, BMC 1, CBN 19.

My congratulations to all involved – well found!
Mark

Weight: 7.7 g
Diameter: 19 mm