Hi all, I'm new to the forum. I picked up a frame yesterday at an estate sale and although there's a fat city sticker on the head tube, there's also just a comp sticker on the top tube. There's a rubber skirt between the head tube and fork. What's puzzling is there are two letters before the serial number. The # is gz873116. Is this a fat city or did someone repaint and throw some decals on it. On the seat tube there is also a fat city decal, made in Somerville, mass. These are the only decals on the bike. thanks in advance. I'll try to post some pics later, unfortunately I'm not the most computer savvy guy out there.