Thanks a lot for your help,
Simon
the reading sequence should be
miea njfb okgc plhd
i recognised these characters:
a: 芳 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E8%8A%B3
b: 艸 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E8%89%B8
c: 有 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E6%9C%89
d: 情 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E6%83%85
i: 雁 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E9%9B%81
k: 南 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E5%8D%97
l: 浦 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E6%B5%A6
m: 人 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E4%BA%BA
n: 倚 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E5%80%9A
o: 西 http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=%E8%A5%BF
therefore, i guess the seal is something like this:
芳草有情．夕陽無語．雁橫南浦．人倚西樓
well, i wish the op would provide a higher resolution, and brighter photos of this seal; have fun :)
edited.
i agreed with @vuluvsa, that character k is 飛 (u+98db); and, @droooze, that character p is 廔 (u+5ed4):
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=廔
well, i have difficulty, not to think that it's used incorrectly.
"西廔" cannot be treated as the same as "西樓".
so, imo, it's a serious mistake.
芳草有情，夕陽無語，雁橫南浦，人倚西樓。
This sentence is a part of 宋詞 (a form of classical Chinese poetry )《風流子·木葉亭皋下》 written by 張耒.
張耒（1054年－1114年），字文潛，號柯山，生於楚州淮陰（今江蘇淮安市），祖籍亳州譙縣（今安徽亳縣）。北宋詩人。
The whole article is shown below.
木葉亭皋下，重陽近，又是搗衣秋。
奈 愁入庾腸，老侵潘鬢，謾簪黃菊，花也應羞。
楚天晚，白蘋煙盡處，紅蓼水邊頭。* 芳草有情，夕陽無語，雁橫南浦，人倚西樓。*玉容知安否？香箋共錦字，兩處悠悠。
空恨碧雲離合，青鳥沉浮。向風前懊惱，芳心一點，寸眉兩葉，禁甚閑愁？
情到不堪言處，分付東流。
This poem describes the feeling of yearning for his wife.
However, the maker of the seal has changed one word, i.e., 橫 to 飛。
雁橫南浦 --> 雁飛南浦
The meaning is the same.
