+1 the splinter look is often a give away for lamination error. Im guessing that the date was on the area thats now missing? As I find lamination can happen any time . However I find the later 1800's though the early 1950's to be a time peroid that lamination seems to be more prevalent. As well finding woodies be they cents or nickels.
The date is the entire legend on the lower half of the obverse. It is spelled out longhand, in Spanish: UN MIL N[OVOCIE]NTOS VEINTISEIS. In other words, ONE THOUSAND NINE HUNDRED TWENTY-SIX, in English. So, 1926.
I completely missed that, and yes now I see it...my eye was more so seeking numbers than it spelled out. And again my bad as I did have 3 years of Spanish in HS as well 5 years of French in grade school. LoL but we both know that was many years ago. But I appreciate your correction ,and again learned something new every day as I wasn't aware of where the date was located on that particular coin. I appreciate the schooling.
Looks like a folded lamination to me. The blob at the bottom is the lamination folded over before the strike.
If it was folded over before the strike I would expect the “n” to be a bit bolder. Maybe circulation just wore it down.