Just acquired this Terrier EO Jack that is circa 1910 - 1916. 3 11/16" long. This is a sixteenth larger than their catalog stated. Should be 3 5/8. Guess the finisher went a little light on the wheel. Beautiful brown bone. Jigged and grooved. No chips or cracks. Nickel-silver escutcheon shield. Both blades marked, TERRIER / CUTLERY / ROCHESTER, N.Y. in three lines. Nice Terrier dog's head logo on the back of the master and 27 / 626 on back of the pen. A Robeson of this pattern would be marked 626027 or 62627. Both blades have half-stops and audible snaps opening, closing and at the half-stops. Actually, the blades snap more loudly at half-stop than most knives do on opening and closing. This knife has got some springs. Blades have seen virtually no use, but are patinated. There are remnants of an etch on the master spear that appears to have been, "SHEFFIELD SILVER STEEL" in Gothic style letters inside a fancy etched cartouche with scrolls. Jury is still out on what the etch actually says, but "...SILVER STEEL" is pretty obvious in the correct light. I have never seen this etch on a Robeson or Terrier knife. I have seen "FIRTH'S STERLING STAINLESS STEEL" on a Robeson metal handled knife. That was probably a Robeson self-advertiser.