It looks like the Coach Fake Serial Numbers thread at Ebay's Shoes & Purses forum has been updated, so with Daria48's permission I'm going to post it here. These are serial numbers often found on fakes, especially older ones but also show up on some new bags. Just because a serial number is not on this list, that doesn't mean the bag is genuine. A lot of fakes have correct serial numbers.
The list and any updates can be found at Ebay:
http://forums.ebay.com/db2/thread.jspa?threadID=1000685987&start=0
Bags with any serial numbers from this first group are ALWAYS fake:
NT-4903
NT-4908
NT-4115
NT-4157
NT-9992
DK-8674
TF-6823
TN-4136
TN-4186
TN-9085
TN-9096
TN-9927
TN-9951
4C-8624
4C-9911
40-8624
7H-7456
ANY Coach bag with only two letters or one number and one letter to the left of the hyphen can be assumed to be fake.
501-20 + all similar numbers starting with 101-, 202-, 501-, 701-, etc., followed by 2 or 3 numbers after the dash and usually with a patch that says "made in Korea".
Coach never made bags in Korea and never used serial numbers with only 5 digits like this:
"xxx-xx" or "xxx-xxx" and without the abbreviated "No." in front of the numbers
Coach never made "classic" leather bags with matching sewn-on cell phone holders.
H4B-0516
H4B-0678
H4B-0517
H4B-0520
H4B-0532
HRB-0516
Probably ANY serial number beginning with H4B followed by a style # beginning with 0 is probably fake (a Scooter Bag H4B-9893 and a Bucket Bag H4B-9948 are two of the exceptions), these numbers would only have been used in briefcases.
012-3445
A2G-6094 and A2J-6094 - or ANY bag ending in 6094 - Fake if it's NOT a Demi Bag like this, and even if the style matches, the bag can still be fake:
http://www.coach.com/assets/product_images/drilldown2/6094_d2.jpg
A5B-3906 - fake Sonoma Double Zip Bags
J4D-4133 - Fake if it's NOT a Waverly Bag
L4C-9941 or LAC-9941
M4N-4154
Anything starting with M4N is suspect.
0444-317, 0444-316 AND 0444-315 and possibly others beginning with 0444 - some "classic" fakes are showing up with these numbers and have a number of mistakes in the creed stamps and on the bags themselves. Assume they're all fake
00138 - always fake, with or without any numbers or letters in front of it
308-9875
308-9937 - probably fake
DEJ-9816 and ECC-9816 - fake prefix and incorret suffix, 9816 belongs to a "classic" Duffle Sac
There are some ending in -9927 but aren't Willis Bags
There are fake Signature Stripe Denim Totes and Signature Stripe Denim Satchels using fake serial numbers ending in 11192 and 11190. All these bags are counterfeit. Coach hasn't used these numbers in any of their bags.
Any recent or current model bag with a serial prefix of M3U- is fake. A genuine bag with this number would have been made in 2003.
Any bag with a style number of 6047 that isn't a fabric Signature Satchel like this one is a counterfeit:
http://www.coach.com/assets/product_images/drilldown2/6047_d2.jpg
The counterfeiters also use many legitimate-looking serial numbers but on the wrong style bags or accessories, like -5659 which should only be on a Scribble Tote, -6094 which should only be on a Signature Demi, and -1417 which should only be on an East-West Leather duffle. Accessories with style #5077 are fake, that number belongs to an Optic Bee Tote.
Older bags beginning with K3H-, J8H-, and M4B- prefixes are possible counterfeits especially if the font of the digits of the serial number seems slightly different.
Fake numbers L4C-9941 and LAC-9941 and possibly other combinations ending in 9941 are showing up on a variety of classic-looking leather bags, most with badly wrinkled "stretch-marked" leather and a "Coach" imprint somewhere on the front of the bag, usually off-center. They'll sometimes have cell phone holders sewn on the side of the bag.
GAC- and GAG- prefixes have also turned up lately. ANY bag with just three LETTERS to the left of the dash is fake. Be careful not to mistake a Zero in the center position for the letter O though, all bags made in 2000 will have a zero in the center.
we've seen several Coaches with this serial number:
P7B-4907
Not only are the bags NOT Sonoma Small Bucket Zips, but the first digit "P" is completely wrong and would never be used on ANY Coach. Any bag with this serial number is counterfeit.
Fakes are also showing up with the # J4N-4082 which belongs ONLY to a Soho Bag from 1994 and should look like this:
http://web.archive.org/web/19970214040415/www.coach.com/product/index.html
Any bag with a serial # ending in 9956 needs to be looked at by someone very familiar with Coach, this number should only be on a leather Pelham Bag.
More fake "classic' leather Coaches are showing up with bad creeds and the bogus "overstamping lines" above and below the serial numbers like I mentioned in post # 39. The latest one is a fake light blue tote (always be careful with older bags in unusual colors, Coach's classic leather colors were pretty conservative so anything besides the usual black, brown, navy, mahogany, British Tan, dark green etc should be examined closely).
Watch for these numbers - 0212-578 and 1212-578
Any bag (especially any in the Hippie Flap style) with a serial number of H6S-9135 should be referred to the posters at this board for authentication. The style number belongs only to a Leather Hippie Flap bag but the ones we've seen with this number are either the wrong fabric or have invalid code digits and badly-stamped creeds. A genuine Hippie Flap will NEVER have this serial number prefix.
Also look VERY carefully at classic bags beginning with " H6M- " and with "Made in the United States" at the bottom of the creed, quite a few fakes seem to use this prefix.
And a lot of newer style Coaches are showing up with only a 5-digit number after the "No", either on the same line as the last words of the creed or by itself at the bottom of the patch - number 00138 is the most common. All these are fake. Coach serial numbers will never have only five digits.
Serial numbers beginning with the letters N thru Z are not valid Coach numbers and are almost certainly fake
Any bag with a tag or patch that says "Sports Coach" is NOT a genuine Coach
Please remember, just because a Coach item seems to have the right style number, or looks just like the picture from Coach's website, that doesn't mean it's genuine.
Always ask at the tPF Coach Authenticate This forum or the Ebay Purses Forum if you're not sure:
http://forum.purseblog.com/coach-shopping/authenticate-this-coach-302470.html
http://forums.ebay.com/db2/forum.jspa?forumID=1000000009
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WOW! It's mindboggling! Thanks for all the work and for sharing your knowledge again.
OT: I have to get this out of my system: "Mind the lorry Richard!"