Neat little piece Buckstix - like a mini 410.

Yes the original H&R 410's fired a 44 shot shell as well.
Pinched from The firearms forum - read down a bit
https://www.thefirearmsforum.com/threads/antique-h-r-410.47350/

a guide to the manufacture era of any H&R 410 bore single barrel shotgun is;
410-44 = 1916-1921 2 inch chambers
410-12mm= 1922-1936 2 1/2 inch chambers (My little girl)
410 (only) = 1937-1941 and later 3 inch chambers