For a short while, they also used Schaller long shafts. How long, dunno. I found examples from 2010 (30th anniversary models):Your '97's are Schaller shortshafts. From around 2012 onwards, G&L switched to Asian Pings; below Schaller quality.
The G&L stamped Schallers were only made with short keys, TMK. The regular Schallers were not. This is noted in post 982.
You might have seen the tall keys here and there on pre-2015 basses, but generally, they only appeared when G&L used standard Schaller bass tuners.
They started off using regular Schaller tuners in 1980. It took them some time to receive a batch of the short key versions with the G&L stamps and tapered posts. Maybe a year or so. These G&L stamped ones were not the lightweight versions, though. They didn't start using those till the '90s.
At one point in the...
And yes, Ping is the lower quality clone of Schallers.