Yep, Someone ground the rear part to make it reachback instead of a standard one piece!!
I recently bough a steel Apel reachback mount for one of my Airsporters or Mercury, Still haven't gotten round to fitting it yet so can't include a pic..
The Raised Maxi grip rails on the Stutzen, Superstar and certain other Beesas are actually a 14mm mount, I had two Lightnings and both came with the wrong mounts as they were standard and I couldn't adjust the windage enough (T'was fully 5" wide to the right with full left adjustment!!)
Found a pic of the Apel but not fitted to a gun!
I bought these mounts some years ago that were made in Ozzie land, They can be centred for windage but aren't reachback so don't really help much
I actually bought a reach back two piece Sportsmatch mount set a few weeks ago, Can't remember what I did with it, Looked through my pics and it doesn't seem to be on any of my guns
John