| Umbo Untitled 1940s (taken) 1989 (print) Gelatin silver print 23 x 16 cm Bassenge Photography Auctions Auction (17 June 2009, Sale 93, Lot 4606) LL/32563 Signed in pencil by Phyllis Umbehr, estate and Griffelkunst edition stamp as well as titled in pencil on the verso.
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