Otto link super tone master USA (Alto)

Hi Everyone,

I have found a Otto link super tone master stamped USA (Alto) online. I have not seen it in person due to location differences. I have asked about the opening size however they are unsure and expressed that it is not engraved on the mouthpiece (I thought it was engraved * on all).

I think it is a 1967 Florida USA mouthpiece, can anyone confirm this? I have attached all the photos I have.

Thanks for your help 😊