On the left is a [090] SN5a. On the right is a [090] SN20c Bubblehead

The insulator has spent a few years on my outdoor tool shed. .for some odd reason it caught my attention . . .yea. . taller than the other CREB's. . .checked out Lee's excellent publication. . .and discovered that it was a SN20c. . a bubblehead. . .

woof!

^..^