Those are the same four in all the pics above top is a 1889 Parker EH 10 gauge on a 2 frame 30" , next a circa 1890 Parker NH 10 gauge 3 frame 32" , second from bottom is a circa 1891 Parker EH 10 gauge with factory original 28" barrels and lastly at the bottom a circa 1899 Parker EH 10 gauge 3 frame 32" .
These two last pics are more recent at the top a circa 1902 Parker EH 10 gauge with factory original 34" barrels , then the 1899 32" from the above pic , then the 1889 30" from the above pic and at the bottom the 1891 28" that's pictured above . They made a very few EH 10's with factory original 26" barrels and fewer yet with factory original 24" barrels I'd really like to have one of each .
The 34" is one of only 14 or so in the EH grade with 34" , the 28" EH is one of only 70 or so EH's with original 28" barrels . If I can find an EH with 26" barrels it's only about 16 or so of them made and the 24" EH they made less then 10 . So I doubt if I ever see an EH 26" or 24" much less acquire either !