First of all, thank you so much for these beautiful images. So much appreciate your hard work doing this.
It’s interesting to me that the only 1958 model is the TLS 50, The lowest priced out of the bunch. When I think of differences between 58 and 59, I usually think fatter neck profile on the 58. But I’m guessing that the year designations don’t really coincide with anything that Gibson did in those years.