That would be in the vintage of the boards them self. My last trip to Puyallup electronics/ Radio , Swap Meet South of Seattle, i picked up boards similar to these, they were of Amp make, wire wrap pin boards, these boards were
common then 1975 / 77 / 80 wire wrap prototyping boards, mostly used by the ones, or two at most for a circuit card / s, . the plating imo, is 30 micro inches. AU. and has a tops value of 2 cents a pin. that would be 30 dollars just for the board pins, and some gold plating, on the board substrate itself, The numbering is of pin location, to aid wiring, "NOt to keep count of each pin as a value " cost " " wishful thinking here. it helps wire the board, a template , you have seen s100 boards. at Puyallup, the S100 Pin board, sell for about 3 t0 5 dollars, " i bought a box full, 15 boards, for 20 dollars, but i was lucky, on Ebay. the pins sell for 50 a thousand, clean pulled and ready to use. Myself, i value the board each at 50 dollars tops, " i would look for this type of item for 100 to 125 dollars, Now if your into Vintage, well then the boards, might be 100 each, " i have some i will sell you, if you feel left out " Gold recovery, Not worth taking apart something, that is useful to a builder, gold recoverable by cyanide strip? i would say, from experience, " yes i have stripped these " lots of work, about 2 grams tops, average 1.5 grams a board, 900 to 1,100 USD for the entire board LOT . GSP is quite rite on this. Cheers all Thomas in Vancouver.