I would really want to know what COCO, COBL, WEWE, WESS stands for.
these are the maker's in-house codes (not KO shop's COAT###, or the old CTO#, FZM#, WST# codes).
coat corp. has three "dvd" release labels: coat, coat west, and coat kuratatsu. the official release codes contain a four-letter prefix and end with three numbers. coat labels start with CO, coat west with WE, and kuratatsu with KU. the next two letters vary, but for coat and coat west they're typically CO and WE respectively, e.g. COCO or WEWE. kuratatsu seems to be KUCT.
the first digit of the three-digit number indicate a "series." COCO1 is athlete's conquest, COCO6 is fellatio zammai, WEWE2 is grand slam, and so on. the final two digits indicate the number of the work in the series indicated by the first digit.
simple one: COCO6 is fellatio zammai, and COCO680 is fellatio zammai 80. the COCO6 grouping has so far only been for zammai. less simple: the first digit might have multiple series. WEWE6 contains the style one series. but style one 58 is not WEWE658 because the WEWE6 group also has jump and joint in it. style one 58 is the 93rd release in the grouping, WEWE693, and WEWE658 is joint 05.
some series will have a different two-letters after the label prefix. coat west straight style is WESS, coat babylon is COBL, and kuratsu fine is KUFN. if the last two letters are not the default COCO or WEWE, then the number is a simple three digit number and the first digit usually carries no meaning (WESS is the straight style prefix and straight style is WESS0, but G.G.G. codes are WESS5, but i can't think of any current releases with a special letter code that don't follow the three-digit sequential pattern).
between the letter and number portion, CK-download omits the "DV" but the DVD packaging and DVD websites listing the official code will include it.
compilation and rerelease codes have a different system. i don't have an exhaustive list of the code system, but this is an overview of how coat's in-house system works.
power-searching coat codes by probability
pre-2020
1. old-style code (CTO, WST, PGR, etc.)
2. coat code with and without DV
3. ko-shop codes (usually post 2015)
post-2020 - two-way tie.
2. coat code with and without DV
2. ko-shop code
