Top is "195" aka "Fat Boy". Note larger handle, exposed black retainer ring, wider adjustment band and different knurling on the "195". Slim is nickel plated Mfg 1961 - 68, weight 71.1 grams. "195" was 1st Gillette adjustable razor and sold for $1.95. Mfg 1958 to 1961. Also nickel plated.
