Originally Posted by
2Donkeys
Not correct, I'm afraid. A part 61.75 licence is valid either on the basis of a valid medical supporting the underlying licence, or on the basis of an appropriate US medical (which for private pilot purposes includes the Class 3). Check out 61.75(b)(4)
Now we come to penny-pickin'. The 61.75 license may be valid on the basis of a 3rd class medical - if ever anybody issues that on such constellation -, but as the underlying foreign license has to be valid to execute the rights on the 61.75 and I never heard of any foreign license granted execution rights on the basis of the non-ICAO US 3rd class medical, you need the appropriate medical of the underlying license to render that valid.