Scope Rings for Browning Automatic .22

[Silver Bear]

I own a Browning Automatic .22 rifle made in Belgium that was purchased in 1958.  It has dovetail scope groves cut in the receiver.  I want to purchase a scope for the rifle.  Does anyone know whether the dovetail groves are 3/8 of an inch, 11 mm or 13 mm?  Also I would appreciate any scope recommendations for the rifle.

Thanks