I need help identifying this trumpet. I’ve looked everywhere and couldn’t find anything, so I’m hoping someone here maybe knows something

From the engraving on the bell I can tell it is a Japanese Nikkan trumpet, which was absorbed by Yamaha somewhere in the 1960’s. Everywhere online says Nikkan no.2, but on the second valve mine says no.1, which leads me to believe it’s a different model. If anyone has any idea where to go, or if there’s someone with expertise that I can message to ask the question that would be great lol. Thanks