Curl,
The Dominion is very likely cocked by the rods being pushed back by the dogs (which can be rollers in some cases) on the forend.

As I mentioned before - many Scott back acion sidelocks didn't have these cocking rod retraction buttons, it depended on the type of back action lockwork used (and also they were far less frequetly used on ejector guns).

Most H&H marketed (Scott built) Dominion guns didn't have the buttons either.

I've got two Scott built guns - one has buttons & one does not. Altough outwardly similar (even to similar pin placement on the locks) there are many differences evident when taken apart.

Regards
Webley