Looks like a Yeoman to me too.
These low line AYA guns are an odd overlap.
Yeoman (a non ejector).
Yeoman Ejector. Yes there was Yeoman Ejector.
No 3 (a non ejector).
The visible difference is the pins on the Yeoman. On both types of Yeoman they are simply driven through. Like on a Webley 700.
Here's a Yeoman in an advert:
12 gauge AYA Yeoman Side by Side Shotgun. Lady's Wood Shooting School – Please call 01454 294546
ladyswood.co.uk
On the No3 you've got them as on the No4. Here's a No3 in an advert:
Mechanism N/E Manufacturer AYA No.3 Barrels Double Calibre 12 Bore Barrel Length 28" For more details on this Gun or any of the Guns that we have for sale please call us on 01296 655477
www.threeshiresgunsmiths.co.uk
Supposedly if a Yeoman or Yeoman Ejector it'll have that engraved over the right hand chamber
As with the Countryman sidelock. Or the boxlock English Game. But...
But I've seen both Yeoman AND Countryman where that has been removed.
And I know it has been removed as I have viewed the gun(s) when it had it still in place.
The internet.
A punter's friend as it is so easy to search a gun now in past auction catalogues with make and serial number.