Plate - qing with marks

[haukech]

Dear All,
I found this in a clearance.
I am just a bit doubtful with the mark. Also i have seen this pointing letters on the surface in some pictures. Yonghzen?
Thanks for your help.

[Stan]

This is Jiaqing period in my opinion.

[peterp]

Jiaqing marked. No doubt from the period.