Vintage Bausch & Lomb Microscope Patent Date 1915 NICE Brass AND 3 Optics. DOCTORS MICROSCOPE. WITH MIRROR, ONE SIDE FLAT ONE SIDE CURVED. AND SWING OUT MAGNIFIER WITH OPEN AND CLOSE SHUTTER. TOP LENS THROUGH TUBE IS 10X. THREE ROTATING LENS ARE: 16MM.0.25,,,10X,,, OIL  1MM  1.9MM 1.25   97X,,, 4MM,,0.65,,43X. DO NOT EXACTLY KNOW WHAT THIS MEANS BUT CLEAN LENS, SCREW OFF AND SIGNS OF BRASS POLISH IN THREADS. SITES SAY SERIAL NUMBER WAS ON A CARD IN THE BOX, THIS HAS NO BOX. MARKED ON BACK.  PAT. JAN. 5, 1915.  NICE FOR A DOCTORS GIFT OR A STUDENT TO LOOK CLOSELY AT THE SITUATION. 13 INCH HEIGHT ABOUT 8 INCH FRONT TO BACK. TAKES A BOX AND CARPET FOAM PADDING TO GET IT TO YOU SAFELY.