A reserve price is the minimum price the seller will accept. This price is hidden from bidders. To win, a bidder must have the highest bid and have met or exceeded the reserve price.
Here is a perfect example of the classic American-made Stanley No.59 Doweling Jig (US spelling!). The jig shows absolutely no signs of ever having been used and retains a shiny nickel-plated finish.
I understand these jigs originally came with six guides. This one has collected some extras along the way. Two are marked 5/16", two marked 1/4", one marked 5/8" and there are five other unmarked sleeves/guides. In addition, there are two knurled sleeves with clamping screws which I think are depth stops.
Further information on this jig is available on the Internet, refer for example: