Wrong diameter, fake coin?

Hi there,

I have a coin that is 35.6mm in diameter but it's weight is correct at 20.00grams

this is the coin, 1912 One Peso Philippines
https://en.numista.com/catalogue/pieces4634.html

This is the original coin details below:
Features
CountryPhilippines
PeriodInsular Government (1901-1935)
TypeStandard circulation coin
Years1907-1912
Value1 Peso (1)
CurrencyPeso (1857-1967)
CompositionSilver (.800)
Weight20 g
Diameter35 mm
ShapeRound
OrientationCoin alignment ↑↓
DemonetizedYes
ReferencesKM# 172, Schön# 12

maybe our sheet is wrong, here it is also 35.5mm https://www.acsearch.info/search.html?id=4797769

I have 4 of these types and they are all about 35.5mm give or take a very small amount. I agree that our catalog is probably wrong but I cant be that precise because I don't have a caliper.

Edit. The 1912s is a highly desirable date so be very careful about quality counterfeits.

Not sure if this is helpful, but the Red Book gives a diameter of 35 mm.