drawing a line across the top of the christie photo shows their 'slight curve' to be a bit less than mine, near enough straight.
i had a look at christies site for sale 5427 in london on 17DEC08 and did not see it in there, wonder what the lot no. was. there were a large no. of arms and armour in that sale no. some nice pieces.
Linky to christie's site for past sale 5427