I found this info some time ago that I put in my bourbon notes document, it may help some appreciate and shed some light on what we mean when we say pewter top and the original bottling. I cannot recall who originated it, so I can't give credit other than to say it wasn't me:
"Kentucky Spirit Variations:
1- The first is what I call the 'original' KS bottle. It had a pewter stopper, dark and light grey neckband with silver writing, and a silver and black label in the center of the bottle similar to today's just different colored. Also, it had very dark grey writing under the sticker saying Single Barrel Kentucky Straight Bourbon 750ml. This writing is very hard to read due to it being such a dark grey.
2- The second variation I have seen is the same exact bottle as mentioned above except the grey writing on the bottom was replaced with the light tan colored writing we are familiar with today. I would guess that they made a bottle change so the writing could be more easily read but they kept using up their old stock of labels, or the label change took a bit longer than it did to implement the new bottles.
3- The third bottle used the bottles see know today with the light colored writing on the bottom but had label changes such as a brown neckband with light colored writing and a center label that is more easily viewed in brown and white colors.
4- Finally, the fourth bottle is the exact same as above, but with a wooden stopper replacing the beautiful pewter stoppers."