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I've heard of "naked lady in pentagon" art appearing on Conn tubas with serial numbers dating from the 1930's through 1965. Does anyone have an especially early or late instrument from those decades that would suggest when the lady was "introduced" and/or "retired"?

Or have some other way of knowing what dates that art ranged?

Thanks!

I have a conn sousaphone with the naked lady engraving. I think it was made in the early 90’s

According to the serial number... E84606... my 20J was made in 1965. On the other hand... the bell (with the logo) might not have come on that horn.