Great to see some attention on Meriden doubles. I can add a few more data points to the collection:

12 Ga 38419 AJ Aubrey K28 35 (28" Krupp ejectors)

12 Ga 41910 Meriden Firearms C30 (no grade - heavily engraved w/flying turnips)

12 Ga. 48517 New Aubrey T32 40 (32" twist)

16 Ga. 70163 The Meriden Firearms Co. S28 19 (my favorite)

12 Ga. 75395 The Meriden Firearms Co. S30 18

12 Ga. 322512 AJ Aubrey S30 18 (The serial number really is 6 digits)

All guns are hammerless and all but the K28 have extractors.