Hi Hyacinth -The fonts all look similar. The only differences I'm seeing is that one is either more deeply stamped or less worn than the other, and the serial number is positioned a bit differently. But serial numbers were stamped separately back then. What other differences are you seeing?
The "1"s in the eBay bag are different from the "1"s on the Etsy bag. On the eBay bag the top serif in the "1" is straight across, on the Etsy bag it slopes down. On all the authentic bags I have the "1" matches the Etsy bag and even now Coach uses a slanted top serif, even though it doesn't use the bar at the bottom any more.
The bottoms of the "5"s are also more rounded in the Etsy bag. The top of the loop of the five is higher than the bottom end of the ascender (the line that goes up to make the side of the 5), on the eBay bag the loop of the 5 goes straight out and is even with the bottom of the ascender.
If the bags were from different plants or manufactured years apart, then maybe I would expect a change. However K1D and F1D would only be five months apart.
The fact that the serial number was so off center seemed like a flag so I started really looking at it.
Including the links again so you don't have to go back in the thread:
eBay bag: http://www.ebay.com/itm/COACH-9715-...rQcqD7ikAf5GFEVx1D2r0%3D&orig_cvip=true&rt=nc
Etsy bag: http://www.etsy.com/listing/103269015/reserved-vintage-dark-brown-leather
Thanks in advance for your thoughts on this - I might be getting paranoid.