1/48 verfied!
I scanned the Panther part, my R2 strip, and the Harrier engine part seen on the Y's underside in the pic--all three parts in one scan so they'd be to scale:
Then I scaled the resulting pic so that the Panther part was the same size as the one in the source pic. I wanted to see if the other parts would match their counterparts as well after this rescaling.
Here's the source pic:
...and here it is with my scaled scans overlaid, semi-transparent:
The Harrier part is problematic because of the angle and the fact that it's farther away from the camera. So that data gets thrown out.
But the R2 strip matches perfectly.
So I believe 1/48 is the correct scale for this part.
HOWEVER: I don't think for a second that the ILMers would've filled in that corner cutout on the "X" detail. Absolutely no reason to. So IMO the Bandai 1/48 Panther is NOT the 100% accurate part. The current kit, anyway--I don't know if it's been retooled over the years.
But I take star-art's point. I'll probably use this part if the correct one doesn't surface.
Backing up a bit to the Harrow part with the proposed 1/48 Bandai valve cover: I scanned a valve cover from the Panther alongside the Harrow part for some more Photoshopping. Here's the result:
The cut-in angles seem sharper in the source pic, although that could be the lighting. Plus, one could argue the Panther part is a
tiny bit too long, even with the portion on the right removed as I have done to match the pic. Damn close, though. Might be worth a look at another 1/48 Bandai tank.