There is sinus rhythm with RBBB.
There is also an rS in inferior leads, and qR in aVL, consistent with Left anterior fascicular block (LAFB).
The RBBB, however, does not have an rSR’, but simply a qR-wave (a very tiny r-wave which is less than 0.5 mm is analogous to a Q-wave). RBBB in V1-V3 that begins with a Q-wave is a sign of MI, whether new or old.
There is also a bit of ST Elevation in V1. In RBBB, the ST segment that comes after a large R’-wave in V1-V3 should have slight ST depression (in other words, the ST segment should be discordant to the R’-wave, similar to discordance in LBBB).
Leads V2 and V3 do show appropriate discordant ST depression.
RBBB generally has zero ST elevation anywhere, although there are occasional cases in which a small amount is present without pathology.
If you see STE in RBBB, you should suspect acute MI.
I have not seen an acute MI in the context of RBBB that had STE only in lead V1, which is why I was not entirely convinced by the ECG.