Interestingly, one of the objectives supplied with this instrument, a 1/8 with correction collar, was made specifically for this microscope by J. Grunow of New York, suggesting that this microscope was imported and used in America during the 1860's. As with the Merz objectives, this objective has engraved on the canister with the magnifications achieved with the four different eyepieces. The Merz objectives are a 1/3, 1/6, and 1/18 (immersion) with correction collar.