Def not a pantera cause I'm pretty sure back in 1991 pantera wasn't even in the model range yet. Wasn't until 1996 I think when a Alu pantera was around.
1992 was the first year the Pantera AL was introduced, a Taiwanese made 7000 series heat treated aluminium frame and it was obviously an entry level model with similar spec to the GT Tequesta of that same year. It came in two colours, Silver Grey and Inferno Red (which I bought in 1993 after my '92 GT Timberline got stolen).
No it is not. Pantera's (Inferno Red or Silver Grey) were introduced in '92 and were made in Taiwan. Serial number would not be on the rear drop out either. I have a '91 Zaskar myself and can verify that the OP's frame is a Zaskar.