Vintage Budweiser Thermo-Serv Plastic Mug- Made In the USA

Vintage Budweiser Thermo-Serv Plastic Mug Made In the USA. In good condition. A stain on the brim that won’t come off when hand washed. There’s also a small line on the inside. I’m not sure what it is, the mug itself is not cracked or broken in any way. Vintage from the 70’s or 80’s.