Hi,
just checked the chip guide about my favorite casino here is all the errors i found.
regards
nb: Most duplicates are caused by scanned pictures. with the scanner the chips have heavily faded colours and you can think they are differents.

Error list:

sbm loews : duplicates:
CG062650 = CG099300

Grand casino jeux americains

CG114266 = CG173231

CG062649 = CG099304

CG073346 = CG101304

Grand casino roulette / trente et quarante etc chips :
5 francs roulettes: duplicate x 10 !!! CG138210 = CG166283 = CG166284 = CG062350 = CG062350 = CG099306 =CG090330 = CG095647 = CG166286 = CG126480 !!!
always the same chip the reverse number is only the ten thousandth from serial number. Ex: chip CG099306 serial 21292 reverse number 21, CG090330 serial 31 291 reverse number 31 etc.

idem for 10 francs chips: CG062351 = CG091938 = CG180584 = CG166287 = CG182063

Wrong information: CG114157 & CG114158 & CG114159 &CG114160 & CG114161 & CG114162 & CG114163 were not used in 1976 !
they were used since 1998 for advertising and also as change chips from the Hôtel de paris. Ex: you had 30€ to 50 € as gift (buyed or offer by the hotel) and chips were immediatly changes at the table with the current euro chips.

scanned pic, fade colour: CG166316 = CG173256

scanned pic, fade colour : CG166303 = CG073328

scanned pic, fade colour : CG166304 = CG095670

scanned pic, fade colour : CG166306 = CG073539

different light but same plaque ! CG073329 = CG173172

idem, different light but same plaque : CG095672 = CG173171

duplicate plaque: CG095637 = CG173220

scanned pic, fade colour : CG073344 = CG073344

same plaque! CG096376 = CG173170

three duplicate here : CG123943 = CG166309 (scan fade colour) = CG173175

CG173174 = CG173221