Price guides are around $200, and actually aren't too far off for this one. The Slanted 55s without the "knob on ear" aren't that common. One sold on
ebay last month for $143 (great deal,) and on Heritage for $188. $200 wouldn't be bad if you could get it. I might start lower, say $170. There's also a 10%
ebay bucks deal floating around in some areas today if you can find it.