Grading Copper Cents - Numerical Grade Vs. Color

for ICCS, as a rule
MS63 seems to be the upper limit for Brown
MS64 for Red and brown
Not so for many collectors or other TPGs

I consider technical grade separate from color.
John1

I've seen the same thing DBM

PCGS:
1858-1901 goes up to 66 in RD and RB, 65 in BN
1902-1910 goes up to 66 in RD, RB and BN
1911-1920 goes up to 67 in RD and BN, but RB is only up to 66
1920-1936 goes up to 66 in RD, RB and BN
1937-1952 goes up to 66 in RD and RB, 65 in BN

Looks like PCGS doesn't cap grade based on RB/BN
Personally I have a 1c 1935 MS-65 RB

NGC is the same way listing MS-66's in BN; I have a 1897 MS-65 RB.

Wow SPP-Ottawa ! The 1924 & the 1940! Now those are the types of coins I prefer over Red. And PCGS graded them high as well, nice! I think to many, Red means $$$ but the Darker, Colorfully toned coins are real natural works of art and in my mind, there's almost no price for that. A pristine old red cent is truly beautiful as well and it did take some doing to preserve it as such for so many years and can be appreciated for that but I find coins almost left to their own that take on colors & shades like yours and so many others I've seen well..., there is almost no price in my book.

Here's two I picked up because nobody bid high. Paid I believe $75 for the two, they were sold as a pair. 1898-H (High & Low H) one of each with a blueish-purple sheen & razor sharp edges on both. The photos are the actual colors under normal daylight from any angle, only getting darker & lighter. I think these will be heading to PCGS. Too bad for the Obv. Fingerprint on one of them but ICCS gave both a MS60 Lustrous Brown. The don't look brown nor MS60 to me at all...haha

https://www.ebay.ca/itm/201615346331
https://www.ebay.ca/itm/201553185277
Just found these! ICCS MS-64 Lustrous Brown
Is this a big rarity / ICCS mistake / exception to the rule?

Maybe ICCS's limit is MS-63 for Brown and MS-64 for Lustrous Brown

I agree, I think ICCS was hard on your two, the high H maybe deserving a 62 ICCS and the low H deserving a 62/63 ICCS
Always I find I can guess PCGS grades MUCH more accurately than ICCS - sight unseen.
Always remember ICCS grades on the flat fields of a coin.

What might be happening here is that since ICCS is only grading on a scale from 60, 62 or 63 for Mintstate browns, its falling into the "good (60), better(62) and best(63)" type of categories... Instead of corresponding to their RB or RD counterparts for grading

I agree completely
That's why I like PCGS' standard of grading:
60% weight on Surface Preservation (wear/marks/dings)
15% weight on Strike (full/weak die strike)
15% weight on Lustre
10% weight on Eye Appeal