On English guns, most of the original, flat-top checkering that I've seen has been on 19th century guns. Most of them have been hammer guns.
A friend of mine ordered a Best grade O/U and he had to fight to have them put flat-top checkering on it.
Here's an all original Rigby rifle from 1911 with a cheekpiece:
http://www.champlinarms.com/Default.aspx...&GunID=1745I can't tell which style of checkering it has.
Here's another rifle from 1902:
http://www.jamesdjulia.com/auctions/catalog_detail_shots.asp?Details=37407&sale=264That doesn't look like flat-top checkering to me. I may be wrong, though.
The checkering on this shotgun looks pointed:
http://www.gunsamerica.com/968526274/Guns/Shotguns/Rigby-Shotguns/John_Rigby_Sidelock_12ga.htm#I don't know if it is original.
OWD