The shell seems a bit long but the opening seems like it is wider than a 4 1/2” pocket ( more than 2 balls).
The shelf is supposed to be under 2” long (1 7/8” max and never shorter than 1 5/8”). The rails are awful.
Here’s a photo of the pockets with 4 1/4” opening. Indeed, the shelf a a bit shorter but meet regulations.
But the pocket rails are straight….no curvature at all. Balls that hit the rails without side spin drop unless
struck too hard. Everyone knows, or should, that hard struck balls result in shrinking the pocket size whereas
slower struck balls result in a friendlier pocket size.
Pocket rails that aren’t straight need to be repaired since the rails in pocket billiards are supposed to be straight.
Look at the rails in the below photos that have 4 1/4” opening which I think is plenty big and my preferred size.