I like this one too. I am surprised to see the current market price in the same range as a Piping Rock or Coronado.
Actually, the price is more in line with the Spur (and should exceed it given its rarity and scarcity). Here is some data:
1928 Piping Rock
14K white 5,985 manufactured $1,375 avg. selling price (eBay)
14K yellow 3,812 manufactured $1,425
Coronado
14K white 2,470 manufactured $2,450
14K yellow 1,530 manufactured $2,550
Spur
14K white 686 manufactured $5,250
14K yellow 502 manufactured $5,200
Cambridge
14K white 357 manufactured 1 seen, but not sold on eBay in 6 years
14K yellow 209 manufactured 1 sold on eBay for $4,500 in 6 years
Of these models, over the last 6 years, I've seen dozens of Piping Rocks, 2 white Coronados, more than 2 dozen yellow Coronados, 12 white Spurs, 4 yellow Spurs, 1 white Cambridge that didn't sell, and only 1 yellow one (mine).
Regarding mine, I was lucky enough to see it right after it was listed on eBay with a Buy it Now price of
$750 :w00t::w00t::w00t:, which at the time was the price listed in Shugart's watch guide. Price guides err on the extreme low side because they don't always take into account the extreme rarity (and scarcity) of some models. When I snagged this about three years ago, I emailed with several vintage Hamilton extreme WIS's. One had paid $3500 for a white one several years prior and another said he would be willing to pay up to $5500 for a yellow one.