JIAQING SIX-CHARACTER SEAL MARK IN UNDERGLAZE BLUE AND OF THE PERIOD (1796-1820)

The inscription may be translated:
Fishing in solitude at the far end of the stream,
On a leisurely boat ride into the wilderness with a flock of cranes for company,
In the afternoon sun, one begins the journey home,
While long shadows are cast among the distant dwellings.

Followed by the signature, 'Zepei'.