HELP ON MEXICO 1831 8 REALE COUNTERSTAMP

Hi all, hope everyone is well...picked up a super original plastic tub of world coins in manila envelopes, perfect project for the times. Most coins are super original and have not seen the light of day for 50 or more years!
Any help on identifying counterstamp on this coin would be most appreciated....does it add value? Reverse seems to have a mechanical scratch, was this from the counterstamp process?
Thanks in advance. RJ
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Isabel II counterstamp from the Philippines.
Thank you for the info....common?
The counterstamp itself it is. As of the specific coin/stamp combination I do not know. I know almost nothing on Philippines coinage, I am sorry. The host coin itself is not rare, but I have no idea as of how many Guanajuato 1831 with a colon after date ended up with the stamp of Isabel II.
That makes two of us....I guess I have to hope two people REALLY want it:)
These are fairly desirable, but often faked. Eldrich Yap and Janssen Bantugan recently pt out an excellent reference on these, 'Resellos Filipinos', which dives into these by variety. I'm no expert on these counterstamps, but the form appears to be the 5-4-3 configuration (order of the 'beads' of the crown, moving inward), which would date it to 1836-37. Neat coin.
Note that "common" here is relative - this is a $200+ coin today, even with the scratch/cut (which has nothing to do with the counterstamping - just damage). This as a host coin is nothing particularly exciting - though Cap & Rays with these stamps are overall less common than the more typical Peru 8R hosts.
Host is clearly genuine; as alluded to, there are fake stamps and have been for decades. The Filipino collectors who really know these would be best to ask, but stamp looks genuine.
Thanks for the info, good to know...nice original coin....a few other counterstamped coins in the lot...will post shortly. Best RJ
Appreciate the info! Regards, RJ
Sure thing. My focus is usually chopmarked coins, so if you have any examples I'd be happy to give you information on them. Knowledge of counterstamps is more limited, there's quite a bit of variety there.