Postal Card Accumulation, 1873-1920. Box of 400-500 cards, most used or preprinted, most addressed to Harvard College Observatory and reporting the activity of time balls, wide variety of postmarks, some fancy, many small towns or college locations, quite a few foreign, quite a few RPO's, worth taking a close look, very few of the commonest items, condition generally fresh, F-VF or better; note couple mint Hawaii cards; please inspect. Estimate  $150 - 200. $0