This is the first generation Forrest Pin Bin. The bins had simple tapered gates instead of the later spring-style gate. Some interesting details of the early Forrest Pin Bin include:

An adjustable shoulder sling that is NOT a full runner strength.

Rubber keepers on the spine of the Pin Bin to keep it oriented correctly on the sling.

Sewn slots for the pin bin instead of brass grommets as on later models.

Our Pin Bins show two distinctly different bends to the top of the bin where the gate opens.

Included above is the earliest advertisement I have found for the Pin Bin. Its from Climbing Magazine #3, September 1970 and it shows the original gate design.