Here is a showing the shallow hairline annealing line -- Reference [id=713036623]

Red shows the line start just below the turret and run about 3/8" towards the dome. Shallow and very hard to see.

NOTE: I'm selling these insulators on behalf of the Jim Fielding estate -- PayPal (no fee friends and family) or checks are both accepted - I'll provide instructions. I'll also be handling all the packing and mailing.