There were a couple of vessels with the name GERM around in 1873 but this one seems the more likely.
GERM official number 44552 built Wisbech 1866, 85 tons, 74.3ft length x 19.3 x 9.3
owned from 1867 until 1873 by------ Lloyd's Register says H Walker who is also given as master, The Mercantile Navy List says John Walker of Spalding. I would suggest that H Walker was her Master/Owner.
He could not have died as a result of a total loss as GERM was sold to Robert Dennett of Barrow on Humber in 1874 and was finally deleted from the British Register in 1910. Her registration documents are in the National Archive. it appears that her 1873 logbooks and Crew Agreements have been lost or destroyed.