Dimensions: 1"h x 1.3"w x 1" deep
Studio name: 大年 Da Nian
Given name: : Weng Da Nian (1811-1890?)
Inscription: 朗亭先生屬 大年 lang ting xian sheng shu da nian At the request of Mr. Lang Ting (signed) Da Nian
Impression: 沈兆霖印 Chao Zhao Lin yin , Chao Zhao Lin's seal (Lang Ting is Chao Zhao Lin's studio name)
Simple and elegant. The usual 'reading' for a seal is right column-top to bottom, then left column. This one starts top right and reads counter-clockwise
The Palace Museum Beijing, has a Da Nian seal online. They say the side inscription is his signature, but it says 均叔 Jun Shu. I dunno'