I believe greases have gotten much better over the years (decades) and I have no reservations using what ever generic grease is at hand. I have done so, without issues, for years maintaining parents bikes. However, being a bike nerd, I did some investigation and came up with Motorex 2000 as a current favourite. Its soft and sticky and has a base oil viscosity suitable for low speed bearings, like in a bicycle. Incidentally its -very- similar to Shimano Premium grease. Id just get that, one or the other. Hunting for 40 years old unicorn grease is nostalgia, in my opinion.