Help with dating this harmonica, pretty please?

My daughter gave me this harmonica and I was wondering if someone can date it for me and tell me something about it. Please, and thank you very much for any information.

Hi Renee
Thanks for your enquiry, what a beauty! The Auto Valve Harp is a legendary diatonic harmonica with 40 reeds in 20 channels, tuned in octaves and fitted with windsaver valves for greater volume. This one is in the key of E major. According to Hohner Product Management, your instrument probably dates from the 1970s, though it may be earlier or later, as these models don’t have serial numbers, so it isn’t possible to date them exactly. It appears to be in mint condition. I hope you enjoy playing it!

Thank you so very much for the information! I appreciate your reply back.