I find most made after the mid 80's aren't too expensive. Still in that $20-30 range. 60's to 80's closer to $40. 50's closer to $50. And then it starts getting crazy expensive. The black crackle Zippos regularly sell for hundreds and hundreds of dollars. Authentic Vietnam Zippos also fetch a hefty price tag, but there are a lot of fakes out there.
3 and 4 barrel hinges also usually go for quite a bit. The external hinges even more. The hinges are particularly valuable as they are often the first and only thing to break on a case. Zippo does have a lifetime warranty, but they will replace a broken hinge with a modern 5 barrel. A broken 3 barrel hinge is worth more than a working 5 barrel.
They also made 14 hole inserts before moving to 16. These inserts are much more valuable.
So, trying to keep things on track, here is an Imperial Ireland Frontier medium stockman I recently acquired. For the price, I'm quite happy with it! I wanted a knife made in Ireland and I'm not disappointed! I understand that Frontier was Imperials higher end line, most likely manufactured with Schrade's equipment.
The self starting cigar lighter is a nice touch, too!
, I've included the three bladed Utica (pre Kutmaster) below. Interestingly, the scales were a celluloid used by a sub brand of the Sheaffer's Pen company (i.e. W.A.S.P. - Vacuum-Fil). Pen collectors refer to it as the "circuit board" pattern.
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On a Shingle. I have also heard the term applied to other similar delicacies.