Finally got my dream USA-made Stanley at a vintage shop! I thought... but, Unfortunately, the insulation function is gone due to deterioration? It's non-existent. The surface gets hot. However, it's still the original, so its solid feel is amazing. I think the screw cap packing is still functioning. The cup has sticker residue. According to the shop owner, it was made in 1991. It's old, so there are scratches and scuffs, but the exterior damage is relatively minor and adds character. I don't think it's functional, so if anyone wants it as a hobby item, please do.