R65 rear wheel

[Dizerens5]

The attached photo is of the rear wheel center on my 78 R65. There seems to be a crack, visible on the photo just below the large copper-colored rivet. In fact it appears to go right round the wheel center and looks very neat indeed, like an assembly join (but who would join two parts along a line of holes?). The wheel seems rock-steady. Does this look familiar to anyone? If so advice would be appreciated!

[Bob_Roller]

It's a casting seam, my '81 has the same markings .

[Barry]

Mine has the same casting marks. I looked at them with some suspicion at first too.

[Dizerens5]

Thanks Bob and Barry. (Sigh of relief!!)