The main body tube is covered with leather, embossed with gold stamping.
The top eyelens assembly is stamped "E. CVLPEPER. LONDINI", showing that this instrument was modified by Edmund Culpeper of London. Most likely Culpeper increased the length of the top tube.
Comparison of the Marshall in the Golub Collection and an advertisement for John Marshall's Great Double Microscope. Note the difference between the two top pieces.