This is stamped 'Locke / 3693" It is a cable top style. If you know the "U" number, please write to me and I'll post it. The embossing is recessed.

This piece is one of a few interesting porcelain insulators I was lucky enough to have in my possession for just a few days before delivering them to their new owner. I liked them so much, I decided to photograph some of them and post them for reference.