Though there are some threads with bits of info here and there, I was surprised that there was no club for this classic stick. My all-time favorite and one that I've been playing off and on since the early 90s.
Here is the info I've gathered searching across different threads here on TT. I play the 16x18 so I've mostly stuck to that. Anyone who has specs or thoughts on the 18x20 version, which I believe is a bit more flexy, feel free to add!
None this is my original info. I gathered if from other threads and other posters, but I thought I'd collect it all here along with some pictures of my collection of PSCs. Please post yours as well!
Here are the general specs for the 16x18 version.
Head Size: 95 sq. in.
Strung Weight: 12.6oz / 357g
Balance: 11pts Head Light
Swingweight: 326
Stiffness: 72
Beam Width: 21 mm Straight Beam
Here's the old TW page:
https://web.archive.org/web/20030402055330/http://www.tennis-warehouse.com/descpageRCWILSON-61.html
The line was launched in '90 or '91 (a little help?) as the "Pro Staff Classic" then "Pro Staff Classic 6.1 si" and finally the "Pro Staff Classic 6.1."
There were four versions. The first three, from my experience, played pretty much exactly the same and had the exact same specs. The fourth version, which I've played but never owned, didn't feel quite as solid. My understanding is that there wasn't any foam in the shaft of that version, but I cannot confirm that.
First gen: Pro Staff Classic. White butt cap with fairway leather grip stock. 95 sq.in written in the hoop. And made in Taiwan. (farthest to the right on the picture below)
Second gen: Pro Staff Classic 6.1 si. White buttcap, with aircushioned grip stock. 95 sq.in written in the hoop. And made in China. (Second from the right in the picture below)
Third gen: Pro Staff Classic 6.1. White buttcap with aircushioned grip stock. 95 sq.in written in the hoop. And made in China. (The other four from the left)
Fourth gen: Pro Staff Classic 6.1. Black buttcap with aircushioned grip stock. Midplus written in the hoop. Made in China. (Not pictured)