Deffo not leather and, thankfully, easily damaged when they were opening the crates with craft knives.
And yes, I do prefer the Tasco 2-7AG (Jap) over any Optima. I say Jap because the later Tasco 2-7 were made in Tiwan (?) and bizz.
Mind you I also have a Optima 2-7x32 p/x adj scope made at the end of the companies life, when it was owned by Target Sports and thats bizz as well.
ATB
Ian