The Post and cross-hair reticle consisted of a very thick vertical "post" and a regular horizontal cross-wire. The post was also called a "tapered post" since in most examples of this reticle it was thicker at the bottom and narrowed toward the top. The vertical tapered post only came up about half way in the scope. Some manufacturers offered a tapered post without a horizontal cross-wire. This provided a sight picture very similar to a peep sight. If you browse some old shooting catalogs and gun books (try some of Jack O'Connor's books) you will see examples of the post & cross hair.
In the 70's the now ubiquitous "duplex" reticle seemed to replace all of the others. The duplex consists of vertical and horizontal cross hairs with thick bases that narrow where they intersect in middle of the scope's field of view.
When gun shows were still allowed in California I watched for vintage Post & Cross-hair type scopes (the only type available since this reticle was discontinued) and acquired a couple that way. Now you see them on EBAY and they seem to go for a premium over scopes with other reticles. The Weaver K2.5 & K3 and Redfield Bear Cub 2 and 3/4 X are particulalry desirable. The Leupold 3x is also highly coveted, when available, but to my knowledge was never offered with the Post & Cross-Hair reticle.
A 2.5-3x scope with a post & cross-hair reticle is great on a lever action or any other brush gun. I think it would be terrific on a dangerous game rifle. Very fast target acquistion is possible and it contrasts very nicely with most back grounds against which you'll be hunting and shooting. Also, the tapered post only comes up half way in the scope's field and the top part of the field is entirely unobstructed. Rather different from conventional reticules.