(Yuba) "Foster's Bar, Cal., Apr. 18", manuscript postmark (YUB-620) with matching "6 cts" rating on cover with blue Prospecting Miners illustrated cameo design showing Panning for Gold Scene addressed to Swanzey N.H., two strikes of blue "Paid" oval handstamp (undoubtedly an Express Company marking), Very Fine. Estimate  $1,000 - 1,500. $0 (Image)