21st Lancers collar badge query

[Fuzzybadge]

Hello
Have any of you seen a Victorian 21st Lancers officer's collar badge with only two vertically aligned lugs? I have a Victorian 21L frock coat with two vertically aligned holes on the collars, which I'm trying to date and I think this might help, given the short periods for the different badge styles. I have seen some post Victorian ones with that configuration, so I assume this can only be the third pattern, while most of all types seem to have 4 lugs.
Thanks Richard