There is no model number on it, but it's not the MLB-1. In the dark
ages, Palomar made two other magnetic baluns, both bottoming out in
the beacon band. The one I have has three eye bolts: one on the top and
one on each side. You can attach the long wires to the side eye bolts,
that is, they are isolated. A small white wire comes out each side
which is then soldered to the long wire.

The other model had some sort of control box that allowed switching
between a pair of long wires. IIRC, the balun had 3 connections for
long wires. You could pick a pair, which would be in a V shape rather
than a normal dipole. This allowed the antenna to be electrically
rotated (so to speak, since there were only 3 angles).