I wouldn't touch it with a 10-foot pole. Margins have all the earmarks of a fake.
While there are early printing/early use R2c that come close to this more saturated brick red color, you don't find R2a or R2b with that shade.

A genuine R2a would be far less saturated in color, almost a pale reddish brown. Part perfs would follow these same color guidelines.

EDIT: The lot immediately prior to the lot in the original post has the color I would expect from a real R2a.
If we knew the cert number we could find out from APEX who the expertizers were on that stamp.